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The exact circumference of the quarter is 7.53982237 cm
It Called A Divider
circumference = 2*pi*radius or pi*diameter
The diameter of a quarter is 24.26 mm. Circumference is pi* diameter. 24.26 mm * 3.14159=76.21 mm
Circumference is only used for circles. Perimeter is for every other 2D shape.