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Pi is the ratio of circle's circumference c to its diameter d
pi = C/d
This ratio is approximately equal to 3.14159 which is 22/7
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It is used to find the perimeter, volume and surface area of circular surfaces, diagram and solids
it is derived as the ratio of circumference and diameter of the circle
p=2 pie R
p=D pie          (2R=D)
pie= p/D
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