Cut the Knot
Cut the Knot!: Shapes of Constant Width
Description of what constant width means along with the question "are there shapes of constant width?". [Requires Java.]
National Council of Teachers of Mathematics
Nctm: Figure This: Big Trees
What tree is big enough for a car to drive through? Figure it out with this NCTM math challenge on measurement. Find out why understanding measurement is important in everyday life. A one page activity from the NCTM Math Challenges for...
Annenberg Foundation
Annenberg Learner: Math in Daily Life: Home Decorating
This exhibit is designed to show students that geometry really does apply to the real world. By taking viewers through a home decoration project, students learn how to calculate area of a rectangle and circle.
Purple Math
Purplemath: Geometry Word Problems: Introduction
Introduces how to set up and solve simple geometric-figure word problems. Includes advice regarding formulas to memorize.
Jim Loy
Jl's Math Page: The Golden Rectangle and the Golden Ratio
This is a personal site from Jim Loy that describes the golden rectangle and the golden ratio. Includes several diagrams and pictures as well as formulas. A good background in math is helpful.
Wolfram Research
Wolfram Mathworld: General Solid Geometry
This page has links to general solid geometry topics, including depth, height, width, and length. A good introductory site into geometry.