4-(4/3)+(4/5)-(4/7)+(4/9) etc. =pi
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Pi r squared comes from the formula to find the area of a circle.
A = pi x radius squared where pi = 3.14
pi = C / d C = pi times d d = C / pi
Pi X D = Circumference. To find Diamater if you know Circumference, divide Circumference by Pi (3.14).
The formula is pi x the diameter of the circle, which is also pi x (2 x the radius) C = pi * D C = pi * 2r