If a circle has a radius of four units, what is its diameter?

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Multiple Choice

If a circle has a radius of four units, what is its diameter?

Explanation:
The key idea here is that a circle's diameter is twice its radius. The radius goes from the center to the edge, while the diameter goes across the circle through the center, so you multiply the radius by 2 to get the diameter. With a radius of four units, the diameter is 2 × 4 = 8 units. The other numbers would correspond to smaller radii (a diameter of 6 implies radius 3, a diameter of 4 implies radius 2, a diameter of 2 implies radius 1), which doesn’t match the given radius.

The key idea here is that a circle's diameter is twice its radius. The radius goes from the center to the edge, while the diameter goes across the circle through the center, so you multiply the radius by 2 to get the diameter. With a radius of four units, the diameter is 2 × 4 = 8 units. The other numbers would correspond to smaller radii (a diameter of 6 implies radius 3, a diameter of 4 implies radius 2, a diameter of 2 implies radius 1), which doesn’t match the given radius.

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