In a circle, what is the relationship between the diameter and the radius?

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Multiple Choice

In a circle, what is the relationship between the diameter and the radius?

Explanation:
The distance across a circle through its center—the diameter—is twice the distance from the center to the circle—the radius. A radius goes from the center to any point on the circle, while a diameter is a straight line through the center with endpoints on the circle. Along the same line, two radii back-to-back make the full diameter, so if the radius is r, the diameter is r + r = 2r. Equivalently, the radius is half the diameter. For a quick check, if the radius is 5 units, the diameter is 10 units.

The distance across a circle through its center—the diameter—is twice the distance from the center to the circle—the radius. A radius goes from the center to any point on the circle, while a diameter is a straight line through the center with endpoints on the circle. Along the same line, two radii back-to-back make the full diameter, so if the radius is r, the diameter is r + r = 2r. Equivalently, the radius is half the diameter. For a quick check, if the radius is 5 units, the diameter is 10 units.

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