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Ducksters

Ducksters: Kids Math: Finding the Volume and Surface Area of a Sphere

For Students 3rd - 8th Standards
Kids learn how to find the volume and surface area of a sphere. Formulas used for this shape. Example math problems.
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Cool Math

Coolmath: Precalculus Basic Formulas to Know

For Students 9th - 10th Standards
This CoolMath resource provides an introduction to some Precalculus formulas.