Geometry parallel lines proofs worksheet

These Parallel and Perpendicular Lines Worksheets will give the student a pair of equations for lines and ask them to determine if the lines are parallel, perpendicular, or …

Introduction to Geometry Proofs • Activity Builder by Desmos Classroom. Loading... An Introduction to Geometric Proofs, 5 questions that go from dragging reasoning only to dragging both statements and reasoning. Self-checking via conditional statements so an image will appear only if they have completed the entire proof correctly.Geometry: Home List of Lessons Semester 1 > > > > > > Semester 2 > > > > > > Teacher Resources FlippedMath.com Section 3.4 Parallel Lines and Triangles ... Section 3.4 Parallel Lines and Triangles Need a tutor? Click this link and get your first session free! Packet. g_3.4_packet.pdf: File Size: 184 kb: File Type: pdf:PROVING LINES ARE PARALLEL WORKSHEET. Problem 1 : In the diagram given below, if ∠1 ≅ ∠2, then prove m||n. Problem 2 : In the diagram given below, if ∠4 and ∠5 are supplementary, then prove g||h. Problem 3 : In the diagram given below, find the value of x that makes j||k.The cruise industry has been most aggressive segment of the travel industry in requiring customers to have COVID-19 vaccines. Three more cruise lines soon will require passengers t...The converse in geometry applies to a conditional statement. In a conditional statement, the words “if” and “then” are used to show assumptions and conclusions that are to be arriv...Worksheet: proving lines parallelGeometry unit 3 prove lines are parallel worksheet by plain and simple Worksheet equations parallel slope geometry interference wave worksheets perpendicular intercept waves promotiontablecoversWorksheet: properties of parallel lines. Geometry worksheet parallel lines proving proofs pdf …

1) Yes SAMPLE EXPLANATION: If 2 sides of a quadrilateral are parallel and congruent, the quadrilateral is a parallelogram. 2) No SAMPLE EXPLANATION: The opposite sides must be congruent. 3) No SAMPLE EXPLANATION: Without more information, it could be a trapezoid. 4) Yes SAMPLE EXPLANATION: If the diagonals of a quadrilateral bisect …Explore geometry Worksheets for grade 10 by Topic. congruent triangles sss sas and asa. converse pythagoras theorem. volume and surface area. transversal of parallel lines. properties of quadrilaterals. area of rectangles and parallelograms. volume and surface area of cones. arcs and chords.Parallel lines proofs worksheet answers / proving lines parallel 13 3 proving lines parallel worksheet answers — db-excel.com Parallel line proofs worksheetParallel lines worksheet proofs answers proving activity proof geometry chessmuseum school high teacherspayteachers related posts.The red angles below are alternate exterior ones, they are equal.. This allows us to use the supplementary angles that measure (2x) and (3x+15) to set up the equation below.. 2x+ 3x+15 = 180 5x + 15 = 180 5x = 165 x = $$ \frac{165}{5} = 33 $$Jump to a specific example. Yannick Scarff View bio. How to Solve Proofs Involving Parallel Lines. Step 1: Read through the steps of the proof, making note of the given …Geometry: Proofs and Postulates Worksheet Practice Exercises (w/ Solutions) Topics include triangle characteristics, quadrilaterals, circles, midpoints, SAS, and more. …3. Parallel Lines can be a lifesaver. This is an old trick that you would be familiar with as well. Any parallel lines in the proof’s diagram mean that you would use one of the parallel-line theorems. Pass on this wisdom to help your children solve geometry proofs given in the geometry proofs list. 4. If-then logic is always gold

©e Z2t0 h1Z1 k qK UuNtraS ZSZo HfRtqw na cr 6e5 eL KLSC Z.C U 3ASl1lL Qr3i Rguh Nt2s E srIe Ys0e Ir XvYePd2. 7 Z xMkakdJe O lw aiItWh9 tI xnvf 9iCnxi Gtne s LGKecoTmTeZt hrxy G.0 Worksheet by Kuta Software LLC Kuta Software - Infinite Geometry Name_____ Parallel Lines and Transversals Date_____ Period____ Geometry / Trig 2 Name _____ 3.2 Parallel Lines & Proofs Practice Date _____ 1 2 3 l m t 1 2 3 l m t Proof #3 Given: k || l Prove: 1 is supplementary to 7 1. _____ 2. If lines are parallel, then alternate interior angles are congruent. 3. Angle Addition Postulate 4. Substitution 5. _____ Statements 1 2 7 k l tANOTHER WAY. There are many ways to solve Example 1. Another way is to use the Corresponding Angles Theorem to fi nd m 5 and then use the Vertical ∠. Angles Congruence Theorem (Theorem 2.6) to fi nd m 4 and m 8. ∠ ∠. If two parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent.What Are Triangle Proofs? Recall that triangles have three sides and are a construct of three points or vertices. Where any three points can come together to form a triangle, any three lines cannot come together to form a triangle. But in order to prove this, we need some logic and theorems. Let us consider the fact that the sum of all the ...Google Classroom. T V ↔ is parallel to W X ↔ . T V W X Y U. Cody constructed: W U ―. perpendicular to T V ↔. such that U. is on T V ↔. V Y ―. perpendicular to W X ↔. such that Y. is on W X ↔. Cody noticed that U W V ≅ Y V W using the Hypotenuse-Leg …

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If two parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent. If two lines are cut by a transversal so that the corresponding angles are congruent, then the lines are parallel. If two angles are supplementary to the same angle or to congruent angles, then they are congruent.Geometry / Trig 2 Name _____ 3.2 Parallel Lines & Proofs Practice Date _____ 1 2 3 l m t 1 2 3 l m t Proof #3 Given: k || l Prove: 1 is supplementary to 7 1. _____ 2. If lines are parallel, then alternate interior angles are congruent. 3. Angle Addition Postulate 4. Substitution 5. _____ Statements 1 2 7 k l tPractice Problems on Parallel Lines cut by trransversal and angles. Corresponding, alternate exterior, same side interiorThe first one focuses on angles, the second on lines and angles. The third one puts it all together. Homework 1 - We can see that ∠ABD and ∠CBD form a linear pair, so they are supplementary to each other. Homework 2 - Vertical angles are equal is the lead here. Homework 3 - Knowing that two lines are parallel, you can learn a lot.Triangle And Parallel Lines. Displaying all worksheets related to - Triangle And Parallel Lines. Worksheets are 7 proportional parts in triangles and parallel lines, Name geometry unit 2 note packet triangle proofs, Geometry part 1 lines and angles, Ms work 132 153 geometry 06, Parallel lines parallel, Proving lines parallel, Parallel ...Classify an angle as acute, obtuse, right, or straight. Understand and apply the Angle Addition Postulate. Use algebra to find missing measures of angles. Identify and use angle relationships including vertical angles, linear pair, adjacent angles, congruent angles, complementary angles, and supplementary angles.

PARALLEL LINES AND PROOFS 1 worksheet / Page 1 of 5 (pg 3+ contain answers) FIGURE 1 NOTE: When proving a theorem, you may not use the theorem you are attempting to prove as a reason in the proof. 1. USING FIG 1: Prove “If the lines intersected by a transversal are parallel, then the alternate interior angles are congruent. Created Date: 1/26/2014 2:23:54 PM These worksheets help students learn the converse of the parallel lines as well. Benefits of Proving Lines Parallel Worksheets. Proving lines parallel worksheets are a great resource for students to practice a large variety of parallel lines questions and problems. These math worksheets are supported by visuals which help students get a crystal ...Imho the videos (actually there are more of them but they all resort to the same reasoning) about transversals and the ones about the sum of the angles inside a triangle are not consistent because they are circular reasoning : the "sum of angles in a triangle" starts from alleged proof of "angles in parallel lines and transversals", while these video's don't prove anything (it's taken for ...25) Fill in the blank so that the lines are not parallel: Line A goes through Line B goes through----- -----( , ) and ( , ) ( , ) and ( , ) Anything but 26) Write the equations of five lines that are parallel to y x Many answers. Ex: y x -2-Create your own worksheets like this one with Infinite Geometry. Free trial available at KutaSoftware.comProving Parallel Lines Worksheet MATH MONKS O Prove the lines c and d are parallel. 13 Given: Zl = Q Statements Reasons Given: Ll = Q, all b Statements Reasons 3 … Created Date: 1/26/2014 2:23:54 PM Quiz & Worksheet Goals. To demonstrate your competence of parallel lines, you will be quizzed on the following: Angles (corresponding, supplementary, alternate interior, and alternate exterior ...Sep 5, 2015 - Worksheet of proofs for parallel lines cut by a transversal. Students will practice using theorems about parallel lines, including Alternate Interior Angles Theorem, Alternate Exterior Angles Theorem, Corresponding Angles Postulate, Consecutive Interior Angles Theorem, as well as Linear Pair Postul...

Infinite Geometry covers all typical Geometry material, beginning with a review of important Algebra 1 concepts and going through transformations. There are over 85 topics in all, from multi-step equations to constructions. Suitable for any class with geometry content. Designed for all levels of learners, from remedial to advanced. Topics.

STANDARD G.CO.C.9. GEO. Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment’s endpoints. Displaying all worksheets related to - Parallel Lines Proof. Worksheets are Work section 3 2 angles and parallel lines, Ccommunicate your answerommunicate your answer, Parallel lines proof work, 3 parallel lines and transversals, Honors geometry chapter 3 proofs involving parallel and, Unit 1 tools of geometry reasoning and proof, Find the … Angles, parallel lines, & transversals. Parallel lines are lines in the same plane that go in the same direction and never intersect. When a third line, called a transversal, crosses these parallel lines, it creates angles. Some angles are equal, like vertical angles (opposite angles) and corresponding angles (same position at each intersection). 912.G-GPE.2.5 - Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line ... Alternate Exterior Angles Converse. If two lines are cut by a transversal so that alternate exterior angles are congruent, then the lines are parallel. Let me know if I missed anything or mis-typed anything! Learn with flashcards, games, and more — for free. Parallel Lines Proof Worksheet Name _____ Write a 2 column or flow proof on your own paper. 1. Given: l || m; ∠2 ≅ ∠4 2. Given: l || m; ∠1 ≅ ∠4Hand over this set of worksheets on Parallel and Perpendicular Lines to your students for teaching them to identify, draw and determine parallel and perpendicular lines. In addition to this, the set also contains practice worksheets on determining whether two lines are parallel or perpendicular, using points, slopes and equations. of two parallel lines, then it is perpendicular to the other line. If h k and j ⊥ h, then j ⊥ k. Proof Example 2, p. 150; Question 2, p. 150 Theorem 3.12 Lines Perpendicular to a Transversal Theorem In a plane, if two lines are perpendicular to the same line, then they are parallel to each other. If m ⊥ p and n ⊥ p, then m n. Equality is when two things like varibles or measurements are the same numerically: 21 / 3 = 9 - 2 because when you evaluate it they're the same number (7). Congruence is when to geometric figures like lines, angles, and polygons are the same geometrically:YZ WZ. ≅. 6. Choose a reason from this list: Definition of angle bisector Definition of congruent triangles or CPCTC Given Given Reflexive property of congruence Side-Angle-Side congruence. Lesson Plan: Different Methods of Proof Page 1. 2. Mark the given information on the diagram. Give a reason for each step in the two-column proof.

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Implementing the right tools and systems can make a huge impact on your business. Below are expert tips and tools to recession-proof your business. Implementing the right tools and...©e Z2t0 h1Z1 k qK UuNtraS ZSZo HfRtqw na cr 6e5 eL KLSC Z.C U 3ASl1lL Qr3i Rguh Nt2s E srIe Ys0e Ir XvYePd2. 7 Z xMkakdJe O lw aiItWh9 tI xnvf 9iCnxi Gtne s LGKecoTmTeZt hrxy G.0 Worksheet by Kuta Software LLC Kuta Software - Infinite Geometry Name_____ Parallel Lines and Transversals Date_____ Period____When a transversal crosses parallel lines, same-side interior angles are congruent. Angles that form a linear pair are supplementary. Angles that form a linear pair are supplementary. Vertical angles are congruent. Vertical angles are congruent. Learn for free about math, art, computer programming, economics, physics, chemistry, biology ...In this angle worksheet, students list pairs of angles in a figure that fall into each category of angles that are formed by two parallel lines and a transversal. Then they answer True/False with a diagram made up of two parallel lines with two transversals. Designed for 8th grade and up. An 8th grade + geometry activity.Proving Lines Parallel Vertical angles are . NMP QPR QPR PRQ NMP Transitive Property of Congruence PRQ If 2 lines are cut by a transversal such that alt. int. ’s are , the lines are ǁ. m C + m D = 180° If 2 lines are cut by a transversal such that cons. int. ’s are supp., the lines are ǁ.When a transversal crosses parallel lines, same-side interior angles are congruent. Angles that form a linear pair are supplementary. Angles that form a linear pair are supplementary. Vertical angles are congruent. Vertical angles are congruent. Learn for free about math, art, computer programming, economics, physics, chemistry, biology ...16. Given lines p and q are parallel, find the value of x that makes each diagram true. a. b. q 17. Given lines p and q are parallel, find the value of x that makes each diagram true. a. b. q x = 18. Given lines m and n are parallel, find the value y of that makes each diagram true. a. b. 40º m n 130º yº (6x+5)º (2x+15)º p x = 40º m 130º ...Honors Geometry Parallel Lines cut by a Transversal Questions 1-6, use Figure 1. Assume ‖ and ‖ 1. What is the name for the angle pair 2 and 14. 2. What is the name for the angle pair 6 and 7 3. Name all angles congruent to 4 4. Name all angles supplementary to 6 5. If 16 = 50, then 14= ____ and 2 = _____ Utilizing Parallel Lines in Proofs Reasons 1) Given 2) Given 3) If parallel lines cut by transversal, then altemate angles are conguent 4) Transitive property 5) If base angles are congruent, then triangle is isosceles AEK BED 1) 2) 5) ABE is isosceles BED EBA BAE BAE or Recognizing the altemate interior angles... Example: Given: Prove: Circle E This module deals with parallel, perpendicular and intersecting lines. A variety of pdf exercises and word problems will help improve the skills of students in grade 3 through grade 8 to identify and differentiate between parallel, perpendicular and intersecting lines. Some of them are absolutely free of cost! Honors Geometry (Period 2) Honors Geometry is a class designed for 9th grade students who have successfully passed Algebra I in middle school and for 10th/11th grade students that have shown above average skills in Algebra 1. Honors Geometry is a course where students will work on projects and real world applications in order to understand how ... ….

Mathster keyboard_arrow_up. Mathster is a fantastic resource for creating online and paper-based assessments and homeworks. They have kindly allowed me to create 3 editable versions of each worksheet, complete with answers. Worksheet Name. 1. 2. 3. Graphs - Parallel Lines. 1.Worksheets are Proofs with perpendicular lines, Honors geometry chapter 3 proofs involving parallel and, Geometry beginning proofs packet 1, Parallel and perpendicular lines, Geometry proofs and postulates work, Geometry proof practice answers, Math work, Chapter 3 parallel and perpendicular lines. *Click on Open button to open and print to ...Benefits of Parallel and Perpendicular Lines Worksheets. Parallel and perpendicular lines worksheets are helpful to improve the geometry skills of students. Practice exercises in these math worksheets are paced at increasing difficulty to help students grasp the topic better. By practicing these worksheets, students can identify the difference ... ©e Z2t0 h1Z1 k qK UuNtraS ZSZo HfRtqw na cr 6e5 eL KLSC Z.C U 3ASl1lL Qr3i Rguh Nt2s E srIe Ys0e Ir XvYePd2. 7 Z xMkakdJe O lw aiItWh9 tI xnvf 9iCnxi Gtne s LGKecoTmTeZt hrxy G.0 Worksheet by Kuta Software LLC Kuta Software - Infinite Geometry Name_____ Parallel Lines and Transversals Date_____ Period____ 3.3 - Proofs with Parallel Lines. Common Core State Standards: HSG-CO.C.9, HSG-CO.D.12. Expected Learning Outcomes. The students will be able to: 1) Prove that two or more lines are parallel.Dec 23, 2017 · This geometry video tutorial explains how to prove parallel lines using two column proofs. This video contains plenty of examples and practice problems for ... There are all sorts of ways to bug-proof your home. Check out this article from HowStuffWorks and learn 10 ways to bug-proof your home. Advertisement While some people are frighten...2_test_honors.tst. Download File. 3.1_pairs_of_lines_and_angles.pdf. Download File. 3.2_parallel_lines_and_transversals.pdf.25) Fill in the blank so that the lines are not parallel: Line A goes through Line B goes through----- -----( , ) and ( , ) ( , ) and ( , ) Anything but 26) Write the equations of five lines that are parallel to y x Many answers. Ex: y x -2-Create your own worksheets like this one with Infinite Geometry. Free trial available at KutaSoftware.com Geometry parallel lines proofs worksheet, Parallel Lines Class 7 - Displaying top 8 worksheets found for this concept. Some of the worksheets for this concept are Ws properties of parallel lines grade7, Lines and angles grade 7, Work section 3 2 angles and parallel lines, 3 parallel lines and transversals, Angles on parallel lines, Geometry part 1 lines and angles, Parallel lines ..., When two lines are intersecting 7. Definition of an angle bisector Results in two angles being congruent 3. Right Angles are Congruent When you are given right triangles and/or a square/ rectangle 8. Definition of a perpendicular bisector Results in 2 congruent segments and right angles. 4. Alternate Interior Angles of Parallel Lines are congruent, corresponding angles, then the lines are parallel. You can use algebra along with Postulates 3-1 and 3-2 and Theorems 3-1 through 3-8 to help you solve problems involving parallel lines. Using Algebra Algebra Find the value of x for which O 6m. The two angles are corresponding angles. O 6m when 2x +6 =40. 2x +6 =40 2x =34 Subtract 6 from …, of two parallel lines, then it is perpendicular to the other line. If h k and j ⊥ h, then j ⊥ k. Proof Example 2, p. 150; Question 2, p. 150 Theorem 3.12 Lines Perpendicular to a Transversal Theorem In a plane, if two lines are perpendicular to the same line, then they are parallel to each other. If m ⊥ p and n ⊥ p, then m n., This geometry worksheet is designed for high school students. Oct 9, 2016 - Students complete two proofs, each involving two parallel lines and a transversal. Pinterest, Free Geometry worksheets created with Infinite Geometry. Printable in convenient PDF format. Kuta Software. Open main menu. Products ... Proving lines parallel;, Honors Geometry Parallel Lines cut by a Transversal Questions 1-6, use Figure 1. Assume ‖ and ‖ 1. What is the name for the angle pair 2 and 14. 2. What is the name for the angle pair 6 and 7 3. Name all angles congruent to 4 4. Name all angles supplementary to 6 5. If 16 = 50, then 14= ____ and 2 = _____, The Simple Help weblog runs through installing Windows 7 on your Mac using Parallels, so you can experience the hype—from the safety of an easily deletable virtual machine. The Sim..., 3.2 Parallel Lines and Transversals Worksheet (with answers) 3.2 Parallel Lines and Transversals Worksheet (with answer key) In geometry, a line, line segment, or ray is referred to as a transversal if it intersects two or more lines at various points. The parallel planes, perpendicular, skew, and parallel lines will all be iWdenhtiafietd i sin ..., These Parallel and Perpendicular Lines Worksheets will give the student a pair of equations for lines and ask them to determine if the lines are parallel, perpendicular, or intersecting. These worksheets will produce 6 problems per page. These Lines Worksheets allow you to select different variables to customize for your needs., We provide a downloadable IRS business expense categories list to help you identify all your deductions. Taxes | What is REVIEWED BY: Tim Yoder, Ph.D., CPA Tim is a Certified Quick..., Mr. G video aligned with Slope powerpoint. Proving what type of quadrilateral, using slopes - Khan Academy. Parallel and Perpendicular Slopes. Proving a Square with both Slope and Distance. Module 11 and 12 (Similarity and Dilations) Solving For Missing Sides of Similar Triangles (using ratios) Finding Scale Factor., There are all sorts of ways to bug-proof your home. Check out this article from HowStuffWorks and learn 10 ways to bug-proof your home. Advertisement While some people are frighten..., Imho the videos (actually there are more of them but they all resort to the same reasoning) about transversals and the ones about the sum of the angles inside a triangle are not consistent because they are circular reasoning : the "sum of angles in a triangle" starts from alleged proof of "angles in parallel lines and transversals", while these video's don't prove anything (it's taken for ..., Since the release of Windows 7 last week, we've already seen a VMWare Fusion update that runs Windows apps inside OS X with full Aero graphical support. Now Parallels is going head..., 18) Even if the lines in question #16 were not. Any value other than 8. Ideally 0 ≤ x ≤ 10. parallel, could. No, that would make the angles 189° and 206°. Create your own worksheets like this one with Infinite Geometry. Free trial available at KutaSoftware.com., , There are several angle relationships of which students should be aware. Complementary angles are two angles that together form a 90 degree angle; supplementary angles are two angles that together form a 180 degree angle; and explementary angles are two angles that together form a 360 degree angle.Vertical angles are found at line intersections; angles …, Independent Practice: PROOFS OF PARALLEL LINES Geometry Unit 3 - Reasoning & Proofs w/Congruent Triangles Page 170 11. Find the values of x and y that makes a ll c, makes if a b: m 6 = (2 x - 3) and m 1 = (4y + 22) . x = _____ y = _____ 7 12. Find the values of x and y that a ll b: m 3 = (5x - 10) and m 5 = (8x - 5) and, Proofs parallel lines worksheet geometry worksheetsParallel proofs lines proof perpendicular practice two column quiz preview Proofs with parallel & perpendicular linesGeometry proof practice with parallel lines cut by transversals. Parallel line proofs by kim talludGeometry proofs worksheets ., Sep 29, 2019 · YZ WZ. ≅. 6. Choose a reason from this list: Definition of angle bisector Definition of congruent triangles or CPCTC Given Given Reflexive property of congruence Side-Angle-Side congruence. Lesson Plan: Different Methods of Proof Page 1. 2. Mark the given information on the diagram. Give a reason for each step in the two-column proof. , Infinite Geometry covers all typical Geometry material, beginning with a review of important Algebra 1 concepts and going through transformations. There are over 85 topics in all, from multi-step equations to constructions. Suitable for any class with geometry content. Designed for all levels of learners, from remedial to advanced. Topics., Explore geometry Worksheets for grade 10 by Topic. congruent triangles sss sas and asa. converse pythagoras theorem. volume and surface area. transversal of parallel lines. properties of quadrilaterals. area of rectangles and parallelograms. volume and surface area of cones. arcs and chords., Angles, parallel lines, & transversals. Parallel lines are lines in the same plane that go in the same direction and never intersect. When a third line, called a transversal, crosses these parallel lines, it creates angles. Some angles are equal, like vertical angles (opposite angles) and corresponding angles (same position at each intersection). , Practice Problems on Parallel Lines cut by trransversal and angles. Corresponding, alternate exterior, same side interior, of two parallel lines, then it is perpendicular to the other line. If h k and j ⊥ h, then j ⊥ k. Proof Example 2, p. 150; Question 2, p. 150 Theorem 3.12 Lines Perpendicular to a Transversal Theorem In a plane, if two lines are perpendicular to the same line, then they are parallel to each other. If m ⊥ p and n ⊥ p, then m n., There are all sorts of ways to bug-proof your home. Check out this article from HowStuffWorks and learn 10 ways to bug-proof your home. Advertisement While some people are frighten..., Geometry Proofs Worksheets | Parallel Lines and Proofs Check Details Parallel lines cut by a transversal practice worksheet. Parallel proofs lineWorksheet parallel proofs lines geometry worksheets answers math teaching practice classroom mrs teaches activity math2 puns teacher choose board cut Proving lines parallel …, This geometry video tutorial explains how to prove parallel lines using two column proofs. This video contains plenty of examples and practice problems for ..., These worksheets help students learn the converse of the parallel lines as well. Benefits of Proving Lines Parallel Worksheets. Proving lines parallel worksheets are a great resource for students to practice a large variety of parallel lines questions and problems. These math worksheets are supported by visuals which help students get a crystal ..., Triangle And Parallel Lines. Displaying all worksheets related to - Triangle And Parallel Lines. Worksheets are 7 proportional parts in triangles and parallel lines, Name geometry unit 2 note packet triangle proofs, Geometry part 1 lines and angles, Ms work 132 153 geometry 06, Parallel lines parallel, Proving lines parallel, Parallel ..., You have already learned how to that certain angle pairs are congruent if you have parallel lines. Now you will have to use the same logic to work backwards to prove that lines are parallel. Use the following diagram for each proof. n Part 1 – “Mini Proofs” – Proving Lines are Parallel in 2 Steps 1. Given: 1 # 8 Prove: m || n 2. Given: 1 5, Flip. Space. Created by. d_getman. vocab for proof and parallel lines. vocab for proof and parallel lines Learn with flashcards, games, and more — for free.