What we do is that we multiply the radius with 2 to find the diameter, and then multiply the diameter with 3.14 (pi).
73 * 2 * 3.14 = 458.44
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If the circumference of a circle is 12 cm the radius is: 1.91 cm
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A circle with a radius of 9.2 cm has a circumference of 57.81 cm