Parallel Line Theorem Teacher Resources

Find Parallel Line Theorem lesson plans and worksheets
Showing 121 resources
Unit Plan
Texas Education Agency

Texas Gateway: Making Conjectures About Parallel and Perpendicular Lines

For Students 9th - 10th Standards
The student will verify theorems about angles formed by parallel lines cut by a transversal and apply these relationships to solve problems.
Unknown Type
Other

New York State Education Department: Eighth Grade Math, Book Two (2010) [Pdf]

For Students 8th
Part two of three; The March 2010 8th grade Math test from the State of New York. The test is six open-response questions covering topics such as geometry (intersecting / parallel lines, Pythagorean Theorem), measurement (maps), and...
Instructional Video
Khan Academy

Khan Academy: Geometry: Ca Geometry: Triangles and Parallelograms

For Students 9th - 10th Standards
In this video lesson [11:14], the instructor demonstrates solutions to problems #21-25 of California Geometry released state test questions. Problems address understanding of the triangle inequality theorem, angle relationships with...
Instructional Video
Khan Academy

Khan Academy: Geometry: Angles (Part 3)

For Students 9th - 10th Standards
Identifies and defines the types of angles formed by parallel lines cut by a transversal and the relationship of their measures. Discusses Triangle Sum Theorem. [9:48]
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Graphing Calculator Practice Problems: Geometry

For Students 9th - 10th Standards
Practice using your graphing calculator for geometry problems, including the use of the Pythagorean Theorem and the distance formula. If you get stumped or if you would like to check your work, then select the View Solution button, which...
Instructional Video
Khan Academy

Khan Academy: Geometry: Triangle Angle Example 2

For Students 9th - 10th Standards
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles. This video also appears in the Geometry: Triangles strand. [4:55]
Instructional Video
Khan Academy

Khan Academy: Angles (Part 3)

For Students 9th - 10th Standards
Identifies and defines the types of angles formed by parallel lines cut by a transversal and the relationship of their measures.
Instructional Video
Khan Academy

Khan Academy: Triangles: Triangle Angle Example 2

For Students 9th - 10th Standards
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles.
Handout
CK-12 Foundation

Ck 12: Geometry: Proportionality Relationships Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This study guide looks at proportionality theorems for triangles and parallel lines intersected by transversals.
Handout
CK-12 Foundation

Ck 12: Geometry: Angles and Transversals Study Guide

For Students 9th - 10th Standards
This study guide on angles and transversals covers key terms, angle types formed by transversals, postulates and theorems about transversals, and how to prove if lines are parallel or perpendicular. It is available for download with free...
Activity
Texas Instruments

Texas Instruments: Is a Square a Special Case of Rectangle?

For Teachers 9th - 10th
The definition of square can determine whether it is a special case of a rectangle. Using the Cabri Jr. application, students can get a feel for why its definition makes sense. Along the way, they get experience with perpendiculars,...
Instructional Video
Sophia Learning

Sophia: Consecutive Interior Angles Converse

For Students 9th - 10th
This video tutorial describes and provides an example for proving two lines are parallel with the converse of consecutive-interior angles theorem. Students can check their understanding with an assessment.
Activity
Oswego City School District

Regents Exam Prep Center: What Is a Locus?

For Students 9th - 10th
This site defines what a locus is and offers links to five locus theorems. Walks you through the six "Steps to solving a locus problem."
Instructional Video
Khan Academy

Khan Academy: Geometry: Proof: Opposite Sides of Parallelogram Congruent

For Students 9th - 10th Standards
Demonstrates how to prove that the opposite sides of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal and the triangle congruency postulates. [8:30]
Instructional Video
Khan Academy

Khan Academy: Geometry: Proof: Opposite Angles of Parallelogram Congruent

For Students 9th - 10th Standards
This video tutorial demonstrates how to prove that the opposite angles of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal. [4:08]
Instructional Video
Khan Academy

Khan Academy: Geometry: Proof: Diagonals of Parallelogram Bisect Each Other

For Students 9th - 10th Standards
Demonstrates how to prove that the diagonals of a parallelogram bisect each other based on knowledge of the special angles created when parallel lines are cut by a transversal and the triangle congruency postulates. [9:06]
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt Joining Two Midpoints of Sides of a Triangle

For Teachers 9th - 10th Standards
In this task, students must prove that angles and triangles are congruent and that a parallel line passes through the midpoints of two sides of the larger triangle. Aligns with G-SRT.B.4.
Activity
Other

Git: What Is the Slope Intercept Form of a Line?

For Students 9th - 10th
Not only does this site show what the slope-intercept form is, but it helps you find the slope and the intercept of a line. There is also additional information on parallel lines, parametric form, and the distance between two points.
Handout
Math Open Reference

Math Open Reference: Alternate Interior Angles

For Students 9th - 10th
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Study Guide
Other

New York State Education Department: Eighth Grade Math, Book One (2006) [Pdf]

For Students 7th - 9th
Part one of three; The March 2006 8th grade Math test from the State of New York. The test is 27 multiple choice questions dealing with topics such as algebra (translating into algebraic terms, simplifying expressions, evaluating...
Handout
Geometry Help

Geometry Help: Lines and Angles

For Students 9th - 10th Standards
Explains the basic concept of lines and angles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Instructional Video
Study Pug

Study Pug: Perpendicular Line Proofs

For Students 9th - 10th Standards
Video lesson explains angles, lines, and transversals. [9:33]
Activity
Oswego City School District

Regents Exam Prep Center: Compound Locus

For Students 9th - 10th
Loci are applied to word problems in this online tutorial. Practice problems are included. The teacher resource page supplies practical problems.
Instructional Video
Sophia Learning

Sophia: Consecutive Exterior Angles Converse

For Students 9th - 10th
This video lesson demonstrates how to determine if two lines are parallel by using the converse of the consecutive-exterior angles theorem. Students can check their understanding with an assessment.

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Parallel Line Theorem