Geometry

Interactive: Geometry of 3D Shapes - In the world around us, there are many three-dimensional geometric shapes. In these lessons, you'll learn about some of them. You'll learn some of the terminology used to describe them, how to calculate their surface area and volume, as well as a lot about their mathematical properties.

Math is Fun - Geometry - An interactive site explaining the concepts of geometry.

Geometric Solids - This tool allows you to learn about various geometric solids and their properties. You can manipulate and color each shape to explore the number of faces, edges, and vertices.