because they can figure each other out.
example: the diameter is 2 and pi is always 3.14 in math, so to find the circumference you divide 2 into 3.14, and the answer is .157 i think.
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Pi is related to the diameter of a circle through the circumference. C=(pi)*d C = circumference (perimeter of the circle) pi = constant d = diameter
The circumference of a circle divided by its diameter is equal to the value of pi.
Circumference is pi times the diameter
Pi (approximately 3.14) is the ratio of the circumference of a circle to its diameter. It is calculated by circumference divided by diameter.
0.7161972439135291... Circumference = pi*diameter which yields circumference/pi = diameter 2.25/pi = diameter 2.25/pi = 0.7161972439135291...