Circles don't have "length", however:
C = 2*pi*r
d = pi*r
Thus, the radius of a circle can be found by dividing the Circumference (C) by (2*pi):
72 cm / (2*pi) = 11.459 cm
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Remember the circle eq'n C = pi* d Where pi = 3.141592.... ~ 3.14 d = 72 cm Hence C = 3.14 * 72 cm = 226.1946711... cm C ~ 226.2 cm
Area = pi*72 square cm Circumference = pi*14 cm
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If the circumference of a circle is 12 cm the radius is: 1.91 cm
A circle with a radius of 0.5 cm has a circumference of 3.14 cm.