A circle has radius 5 units. What is its circumference in terms of π?

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Multiple Choice

A circle has radius 5 units. What is its circumference in terms of π?

Explanation:
The circumference relates to the radius through the formula C = 2πr. With a radius of 5, substitute into the formula: C = 2π(5) = 10π. That factor of 2 in front of πr is what makes the circumference larger than π times the radius alone, so 10π is the correct result. Misplacing or omitting that factor of 2, or confusing radius with diameter, can lead to other values.

The circumference relates to the radius through the formula C = 2πr. With a radius of 5, substitute into the formula: C = 2π(5) = 10π. That factor of 2 in front of πr is what makes the circumference larger than π times the radius alone, so 10π is the correct result. Misplacing or omitting that factor of 2, or confusing radius with diameter, can lead to other values.

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