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A helpful scientific calculator that runs in your web browser window.

Great (and short)Powerpoint Presentation on Points, Lines, and Planes.

In this Early Edge video lesson, you'll learn more about The Coordinate Plane, so you can be successful when you take on high-school Math & Geometry.

Introduction to plane geometry

Definition of the geometric plane

Explains the differences between parallel and perpendicular planes.

Gives a simple definition of plane gemometry then points to sub-topics and drawing tools to further explain the topic.

Explains how to form and identify planes in a very simple manner.

This page gives the definition and an easy-to-understand description of a 2-dimensional plane.