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. 

MathWorld's definition of a perpendicular bisector, with illustrations to show the different uses of the perpendicular bisector.

Learn about the perpendicular bisector with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation.

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.

A list of geometry definitions and a matching activity.

Learn about line segment bisectors with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

This study guide on bisectors, medians, and altitudes covers key vocabulary, different theorems, and facts about the altitude and triangles. It is available for download with free registration.

Learn about the major and minor axis of an ellipse with this helpful reference tool. Provides a detailed definition examples, and an interactive activity that enhance further explanation. Includes links to related topics.

Explains the basic concept of similar triangles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

A complete reference guide to points, lines, and planes. It provides definitions and interactive activities that enhance further explanation.