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How to use Surface Area Calculator

Choose a solid, enter its radius, height or side length, and the surface area appears instantly with the formula used.

Frequently asked questions

What is surface area?

The total area of all outer faces or curved surfaces of a 3D shape, measured in square units.

How is a sphere's surface area calculated?

Surface area = 4 × π × r², where r is the radius of the sphere.

Does it include the base of a cone or cylinder?

Yes — the total surface area includes both the curved lateral surface and the circular base(s).

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