- 1). Cube the length of a side to calculate the volume of a cube. For example, a side of a cube is 8. Multiplying 8 by 8 by 8 results in 512 cubic units.
- 2). Multiply the measurements of width, height and length together to calculate the volume of a rectangular prism. For example, the width is 5, the height is 10 and the length is 12. Multiplying 5 by 10 by 12 results in 600 cubic units.
- 3). Cube the length of the radius, then multiply it by 4/3 * pi to calculate the volume of a sphere. For example, the radius of the sphere is 4, and multiplying 4 by 4 by 4 results in 64. Pi multiplied by 4/3 is approximately 4.189. Multiplying the cubed radius and 4/3 pi together results in 64 times 4.189, which equals approximately 268.0826 cubic units.
- 4). Square the radius of a cone's base, then multiply it by 1/3 * pi * height of the cone to calculate its volume. For example, the radius of the base is 2, and 2 squared is 4. One-third of pi is approximately 1.0472. Multiplying that to the example cone's height of 10 results in 10.472. Multiplying that product to the square of the radius results in 10.472 times 4, which is 41.888 cubic units.
- 5). Square the cylinder's radius, then multiply that by pi * height of the cylinder to calculate its volume. For an example, the cylinder's radius is 7, and the square of 7 is 49. The height of the example cylinder is 8, and multiplying 8 by pi equals approximately 25.1327. Multiplying that product to the square of the radius results in 25.1327 times 49, which equals 1,231.5043 cubic units.
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