A circle has a radius of 3 units. What is its circumference?

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Multiple Choice

A circle has a radius of 3 units. What is its circumference?

Explanation:
Use the circumference formula C = 2πr (or C = πd). With a radius of 3, the circumference is C = 2π × 3 = 6π. You can check with the diameter since d = 2r = 6, and C = πd = 6π, which matches. The other numbers come from leaving out the factor of 2 or mixing up radius and diameter, which leads to incorrect results like 3π, 9π, or 12π.

Use the circumference formula C = 2πr (or C = πd). With a radius of 3, the circumference is C = 2π × 3 = 6π. You can check with the diameter since d = 2r = 6, and C = πd = 6π, which matches. The other numbers come from leaving out the factor of 2 or mixing up radius and diameter, which leads to incorrect results like 3π, 9π, or 12π.

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