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:
Circumference is found with the formula C = 2πr. With a radius of 5, that gives C = 2π·5 = 10π. So the circle’s circumference is 10π. The other numbers come from mixing up formulas or different values: 25π is the area πr^2 when r = 5; 2π would be the circumference if the radius were 1; 5π would correspond to a diameter of 5 (or radius 2.5), not 5.

Circumference is found with the formula C = 2πr. With a radius of 5, that gives C = 2π·5 = 10π. So the circle’s circumference is 10π. The other numbers come from mixing up formulas or different values: 25π is the area πr^2 when r = 5; 2π would be the circumference if the radius were 1; 5π would correspond to a diameter of 5 (or radius 2.5), not 5.

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