A circle has a diameter of 8. Which pair correctly describes its radius and circumference?

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Multiple Choice

A circle has a diameter of 8. Which pair correctly describes its radius and circumference?

Explanation:
The radius is half of the diameter, so with a diameter of 8 the radius is 4. The circumference is 2π times the radius, so C = 2π(4) = 8π. Numerically, 8π is about 25.13. This pair fits the circle’s size derived from the given diameter. Other options would require different radii or circumferences that don’t match a diameter of 8 (for example, a radius of 8 implies a diameter of 16, and a circumference of 16π would correspond to that larger circle).

The radius is half of the diameter, so with a diameter of 8 the radius is 4. The circumference is 2π times the radius, so C = 2π(4) = 8π. Numerically, 8π is about 25.13. This pair fits the circle’s size derived from the given diameter. Other options would require different radii or circumferences that don’t match a diameter of 8 (for example, a radius of 8 implies a diameter of 16, and a circumference of 16π would correspond to that larger circle).

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