Circumference = 12
Diameter = Circumference/pi
Radius = Diameter/2 = circumference/(2 pi) = 1.9099 (rounded)
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The circumference of a circle if the radius is 12 equals about 75.4
If the circumference of a circle is 12 cm the radius is: 1.91 cm
The circumference of a circle with a radius of 12 meters is: 75.4 meters (r x 2 x Pi = circumference).
Its circumference is: 75.4 inches.
Circumference of the circle if the radius is 12 inches is 2*pi*r = 24*pi = 75.398