WEBVTT

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Here is the problem: Find the volume and surface area of a sphere with radius 3.

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Compute the volume (cubic units) and total surface area (square units) of the solid from its dimensions in one length unit.

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Volume.

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Surface area.

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So the answer is Volume equals 36pi approximately 113.0973355 cubic units; surface area equals 36pi approximately 113.0973355 square units.

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Volume counts unit cubes inside a solid; surface area counts unit squares needed to wrap it. Doubling every length multiplies volume by 8 and surface area by 4.

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Volume 113.0973355 and surface area 113.0973355 are positive.