What is the circumference of a circle with radius 5?

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Multiple Choice

What is the circumference of a circle with radius 5?

Explanation:
The circumference scales with the radius according to C = 2πr. With a radius of 5, the circumference is C = 2π·5 = 10π. Using the diameter form, C = πd, you’d have d = 10, so C = π·10 = 10π as well. The other values would come from different radii: 20π would correspond to radius 10, 5π to radius 2.5, and 2π to radius 1.

The circumference scales with the radius according to C = 2πr. With a radius of 5, the circumference is C = 2π·5 = 10π. Using the diameter form, C = πd, you’d have d = 10, so C = π·10 = 10π as well. The other values would come from different radii: 20π would correspond to radius 10, 5π to radius 2.5, and 2π to radius 1.

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