If a circle's diameter is D, the radius is equal to what fraction of the diameter?

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Multiple Choice

If a circle's diameter is D, the radius is equal to what fraction of the diameter?

Explanation:
The radius is half the diameter. The diameter spans across the circle through the center and is made up of two radii end to end, so D = 2r. Solving for r gives r = D/2, meaning the radius is one-half of the diameter. The other options don’t fit because doubling the diameter would be two radii, matching a different length, and a quarter of the diameter is too small.

The radius is half the diameter. The diameter spans across the circle through the center and is made up of two radii end to end, so D = 2r. Solving for r gives r = D/2, meaning the radius is one-half of the diameter. The other options don’t fit because doubling the diameter would be two radii, matching a different length, and a quarter of the diameter is too small.

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