Divide the circumference of any circle by its diameter and its quotient is equal to pi
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The first person to calculate pi was Archimedes, around 250 B.C. Using the formula:A = pi r^2
pi x (2xradius)
The area of a circle (A) is pi x r x r.The circumference of a circle (C) is pi x d, or pi x 2r.So if you know C, you can calculate r using the formula C = pi x 2r or r = C/2piOnce you know r, you can calculate A using the formula A = pi x r x r
Circumference = 2*pi*radius
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle