What is the circumference of a circle with radius 4?

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Multiple Choice

What is the circumference of a circle with radius 4?

Explanation:
The distance around a circle, its circumference, is tied to the radius by the formula C = 2πr. With a radius of 4, you get C = 2π(4) = 8π. This can also be seen using the diameter: C = πd, and the diameter is 8, so C = π(8) = 8π. The other values would come from different radii (for example, a radius of 2 gives 4π, a radius of 3 gives 6π, and a radius of 8 gives 16π), but they don’t match a radius of 4. So the circumference is 8π.

The distance around a circle, its circumference, is tied to the radius by the formula C = 2πr. With a radius of 4, you get C = 2π(4) = 8π. This can also be seen using the diameter: C = πd, and the diameter is 8, so C = π(8) = 8π. The other values would come from different radii (for example, a radius of 2 gives 4π, a radius of 3 gives 6π, and a radius of 8 gives 16π), but they don’t match a radius of 4. So the circumference is 8π.

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