Unit Plan
Texas Education Agency

Texas Gateway: Parallel and Intersecting Lines

For Students 3rd - 5th
This activity provides an opportunity for students to build an understanding of parallel and intersecting lines.
Handout
CK-12 Foundation

Ck 12: Geometry: Lines and Angles Study Guide

For Students 9th - 10th Standards
This study guide on lines and angles covers key terminology; line notation; parallel, perpendicular, and skew lines; and postulates and theorems about lines. It is available for download with free registration.
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.
eBook
Math Planet

Math Planet: Pre Algebra: Geometry Fundamental Statements

For Students 9th - 10th Standards
Provides examples and a video lesson that introduce fundamental statements of geometry.