Circles & Semicircles: Radius, Diamater, Circumference

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What is the approximate circumference of a circle with a diameter of 10? Use 3.14 for pi (DO NOT ROUND)

31.4

The radius of a circle is 5.4 feet. What is its diameter?

10.8

What is the radius of a circle whose diameter is 15 meters?

7.5

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