Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Congruence of Alternate Interior Angles

For Teachers 8th Standards
Eighth graders are presented with a labeled drawing of two parallel lines intersected by a transversal line. They are asked to discuss congruency of angles when the picture is rotated about a point on the transversal. Aligns with 8.G.A.5.
Activity
Analyze Math

Analyze Math: Parallel Lines and Angles Problems

For Students 9th - 10th
Try these three problems about finding the measures of different angles that arise from diagrams involving parallel lines and transversals. Detailed solutions are written out for these three problems of moderate difficulty.
Unknown Type
Khan Academy

Khan Academy: Angle Relationships With Parallel Lines

For Students 8th Standards
Find missing angles given two parallel lines and a transversal.
Handout
Math Open Reference

Math Open Reference: Corresponding Angles

For Students 9th - 10th Standards
Learn about corresponding angles with this resource which offers detailed explanations and examples. Subjects covered include parallel and non-parallel cases. Links to related topics.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Corresponding Angles

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students about corresponding angles, and how to use them to determine whether or not lines are parallel. Students examine guided notes, review...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Corresponding Angles

For Students 7th - 9th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students identify corresponding angles formed when a line intersects two other lines. Students examine guided notes, review guided practice, watch...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Corresponding Angles

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students identify corresponding angles formed when a line intersects two other lines. Students examine guided notes, review guided practice, watch...
Handout
Sonoma State University

Sonoma State University: Parallel Lines and Similar and Congruent Triangles

For Students 9th - 10th Standards
This site defines parallel lines, parallel lines cut by a transverse, and congruent triangles. It also contains links for related terms.
Unit Plan
Free Math Help

Free Math Help: Special Pairs of Angles

For Students 9th - 10th Standards
The lesson investigates special pairs of angles. Topics explored include complementary, supplementary, and vertical angles. Students learn about the concept and view diagrams and exercises with solutions.
Whiteboard
ClassFlow

Class Flow: Parallel Lines and Planes

For Teachers 9th - 10th Standards
[Free Registration/Login Required] This flipchart defines parallel lines and planes. It defines a transversal, the concept of alternate angles, and vertical angles.
Whiteboard
ClassFlow

Class Flow: Parallel Lines and Angles

For Teachers 9th - 10th Standards
[Free Registration/Login Required] This flipchart regards parallel lines and relationship of angles created by a transversal. Includes lesson on vocabulary, Jeopardy-style game, and quiz.
Handout
Math Open Reference

Math Open Reference: Alternate Exterior Angles

For Students 9th - 10th
Learn about alternate exterior angles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Activity
Texas Instruments

Texas Instruments: Parallel Lines

For Teachers 9th - 10th
This file contains questions related to parallel lines cut by a transversal and the angles formed. The questions can be used to asses your students' understanding of this topic in geometry.
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.
Whiteboard
ClassFlow

Class Flow: Parallel Lines

For Teachers 6th - 8th Standards
[Free Registration/Login Required] This flipchart gives information and examples of the relationships of angles when parallel lines are cut by a transversal.
Whiteboard
ClassFlow

Class Flow: Parallel Lines and Angle Relationships

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Explore the relationships between parallel lines and the rules of angle measurements.
Unit Plan
Texas Education Agency

Texas Gateway: Writing Geometric Relationships

For Students 7th - 9th Standards
Given information in a geometric context, students will be able to use informal arguments to establish facts about the angle sum and exterior angle of triangles, the angles created when parallel lines are cut by a transversal, and the...
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.
Lesson Plan
Alabama Learning Exchange

Alex: Build a City on Geometry

For Teachers 6th - 8th
The students will be split into small, cooperative groups and build a city following specific guidelines. The students will learn how a city is constructed with angles, intersections, parallel, intersecting, and transversal streets. They...