What do you create when you rotate a ray? An angle! Teach all the angle basics including naming, measuring, supplements, and complements. 

Create a strong understanding of the relationships formed when parallel lines intersect a transversal. Discuss each type of angle pair and their relationship to each other. 

Geometry is full of shapes, figures, and corresponding things here and there. The guide shares all of the key pieces of geometric information in a nicely color-coded and labeled sheet. 

Stuck trying to remember the formal language of a geometric proof? Never fear, this handout has them all ready to go. The reasons are sectioned by topic so this handy guide is ready when you are to tackle those two column proofs. 

Everything you wanted to know about angles and more, including 1) how to measure angles 2) types of angles 3) angle relationships and 4) angles around a transversal.

Brush up on your math skills relating to vertical angles then try some practice problems to test your understanding.

Review the basics of vertical angles, and try some practice problems.

Intermath Dictionary's site defines terms relating to angles, gives examples, and offers interactive exercises.

Learn about vertical lines with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.

Learn about alternate exterior angles with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.

A complete reference guide to vertical angles. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

A list of geometry definitions and a matching activity.

This site from the Northeast Parallel Architectures Center, Syracuse University has a very substantial discussion of math topics slope & line equations. The outline form is quite useful if you need to zero in on one aspect of...