4-(4/3)+(4/5)-(4/7)+(4/9)-(4/11)....=pi There are no non-infinite serieses known for finding pi
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d * pi or 2 * r * pi Where d is diameter and r is radius and pi = 3.14159
2 x pi x radius or pi x diameter where pi = 3.14159265
circumference = 2*pi*radius or pi* diameter
area of a circle is equal to pi times the square of its radius.. A=(pi)r^2
James steven. pi = c/d