C = 20.1 cm
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The circumference of a circle with a diameter of 64 cm is 201 cm. Since 1 cm is equal to about 0.394 inches: 201 x 0.394 = a circumference of 79.194 inches.
Radius of circle: square root of (324/pi) = 10.1554125 cm Circumference of circle: 2*pi*10.1554125 = 63.80833861 or 64 cm to the nearest integer
The circumference of a circle if the if the radius is 6 cm is: 37.7 cm
The diameter of a circle with a circumference of 45 cm is: about 14.32 cm
The circumference of a circle with a diameter of 12 cm is: about 37.7 cm