A circle with a radius of 3.3 units has a circumference of 20.73 units.
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The circumference of a circle whose radius is 6 inches is: 37.7 inches.
circumference = 2*pi*5.8 = 36.442 units of measurement to 3 dp
A circle with a diameter of 2.5 units has a circumference of 7.9 units.
Multiply the radius by 2xpi.
537.48377......