C1 = pi x D, C2 = pi x 3 x D, so the circumference is also tripled.
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The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x pi = circumference).
The circumference of any circle is (pi) x (the circle's diameter).
If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x Pi = circumference).