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Circumference of a circle = 2*pi*radius or pi*diameter
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
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
The circumference of a circle with a radius of 12 meters is: 75.4 meters (r x 2 x Pi = circumference).