Because the ratio of the circumference of any circle to its diameter is pi.
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Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
It is used to find the area of a circle as pi*radius2
Area of a circle equals pi (3.14) times the radius squared.
Any circle will work!
Angular measure of a circle: 2*pi radians. Circumference of a circle with diameter d units: d*pi units