If a circle’s diameter is 20 feet, what is its radius?

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Prepare for the CSLB Concrete C-8 License Test with flashcards and multiple choice questions. Get ready for your exam with hints and detailed explanations.

Multiple Choice

If a circle’s diameter is 20 feet, what is its radius?

Explanation:
Radius is half the diameter. A circle’s diameter stretches from one side to the other through the center, so it’s twice the distance from the center to the circle, which is the radius. With a diameter of 20 feet, the radius is 20 ÷ 2 = 10 feet. The 20 feet option is the diameter itself, 5 feet would be a quarter of the diameter, and 15 feet isn’t half of 20. So the radius is 10 feet.

Radius is half the diameter. A circle’s diameter stretches from one side to the other through the center, so it’s twice the distance from the center to the circle, which is the radius. With a diameter of 20 feet, the radius is 20 ÷ 2 = 10 feet. The 20 feet option is the diameter itself, 5 feet would be a quarter of the diameter, and 15 feet isn’t half of 20. So the radius is 10 feet.

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