WEBVTT

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Here is the problem: Find the circumference of a circle with radius 5.

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Circle with radius 5; circumference C equals 2pir.

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Read the problem. Radius r equals 5.

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Circumference. C equals 2pir equals 2pi times 5 equals 10pi approximately 31.41592654.

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So the answer is Circumference equals 10pi approximately 31.41592654.

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Circle with radius 5; circumference C equals 2pir.

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C / (2pi) equals 5, which checks out.