This mini-lesson explores the area of a circle. Provides a definition, examples, and practice questions with answers.

Use this circle calculator to find the area, circumference, radius, or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.

This CoolMath resource provides an introduction to some Precalculus formulas.

Use this online calculator to calculate the volume of geometric solids including a capsule, cone, frustum, cube, cylinder, hemisphere, pyramid, rectangular prism, sphere, and spherical cap.