How to Find the Volume of Basic 3-D Figures

By eHow Education Editor

Pump up the volume in your geometry equations.

Calculate the cube of the length of one side to determine the volume of a cube. Example: The volume of a cube with side length 3 is 3 x 3 x 3 = 27.

Find the volume of a rectangular prism by multiplying its length by its height, and then multiplying this product by the prism's width. Example: The volume of a 2-by-3-by-5 rectangular prism is 2 x 3 x 5 = 30.

Determine the volume of a cylinder by first multiplying the square of the radius by pi. Multiply this product by the cylinder's height. Example: The volume of a cylinder with radius 3 and height 5 is pi x 3 x 3 x 5 = 141.

Figure out the volume of a cone by first multiplying the square of the cone's radius by pi. Multiply this product by the cone's height. Divide this product by 3. Example: The volume of a cone with radius 2 and height 6 is pi x 2 x 2 x 6 x 1/3 = 25.

Multiply the cube of a sphere's radius by pi to begin finding the volume. Then multiply this product by 4/3. Example: The volume of a cube of radius 3 is pi x 3 x 3 x 3 x 4/3 = 113.