If a circle has diameter 14, what is its circumference?

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Multiple Choice

If a circle has diameter 14, what is its circumference?

Explanation:
The relationship between a circle’s circumference and its diameter is C = πd. With diameter 14, the circumference is C = π × 14 = 14π. You can also use radius: r = 7, then C = 2πr = 2π×7 = 14π. The other numbers come from mixing up the formulas (for example, 28 would be 2d, and 7π is πr), so 14π is the correct circumference.

The relationship between a circle’s circumference and its diameter is C = πd. With diameter 14, the circumference is C = π × 14 = 14π. You can also use radius: r = 7, then C = 2πr = 2π×7 = 14π. The other numbers come from mixing up the formulas (for example, 28 would be 2d, and 7π is πr), so 14π is the correct circumference.

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