CSET Math Subtest 1 Practice Test 2026 - Free Practice Questions and Study Guide

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

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5

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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