The circumference of a circle is 2πr. If r = 5, what is the circumference?

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Multiple Choice

The circumference of a circle is 2πr. If r = 5, what is the circumference?

Explanation:
Using the circumference formula C = 2πr. With radius r = 5, C = 2π × 5 = 10π. So the circumference is ten pi. This also fits the alternative form C = πd with diameter d = 2r, giving C = π(10) = 10π. The other results would come from different radii (for example, 5π would come from a radius of 2.5, 20π from a radius of 10, and 2π from a radius of 1).

Using the circumference formula C = 2πr. With radius r = 5, C = 2π × 5 = 10π. So the circumference is ten pi. This also fits the alternative form C = πd with diameter d = 2r, giving C = π(10) = 10π. The other results would come from different radii (for example, 5π would come from a radius of 2.5, 20π from a radius of 10, and 2π from a radius of 1).

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