If the diameter of a circle is 10 units, what is the radius?

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Multiple Choice

If the diameter of a circle is 10 units, what is the radius?

Explanation:
Radius is half of the diameter, because the diameter across the circle passes through the center and is twice as long as the radius. So with a diameter of 10 units, the radius is 10 ÷ 2 = 5 units. If the radius were 2, the diameter would be 4; if the radius were 10, the diameter would be 20; if the radius were 15, the diameter would be 30.

Radius is half of the diameter, because the diameter across the circle passes through the center and is twice as long as the radius. So with a diameter of 10 units, the radius is 10 ÷ 2 = 5 units. If the radius were 2, the diameter would be 4; if the radius were 10, the diameter would be 20; if the radius were 15, the diameter would be 30.

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