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

Students can review basic geometric terms using these self-check, multiple choice questions. Three levels of questions are provided.

Provides examples and a video lesson that introduce fundamental statements of geometry.

This robust lesson plan for upper elementary and middle school grades introduces the concepts for lines, rays, line segments, and planes. Resources are linked to it and ready for your use.

[Free Registration/Login may be required to access all resource tools.] This study guide reviews the terminology for circles (tangent, arcs, central angles) and the equation for a circle.

Learn about the tangent definition in geometry, tangent geometry, tangent to a circle, tangent line equation. Check-out the solved examples for better understanding and try your hand at the tangent line calculator or solving a few...