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Pi has many usages in mathematics some of which are:-
Area of a circle = pi*radius squared
Circumference of a circle = diameter*pi or 2*pi*radius
Surface area of a sphere = 4*pi*radius squared
Volume of a sphere = 4/3*pi*radius cubed
Volume of a cone = 1/3*pi*radius squared*height
The value of pi is found by dividing the circumference of a circle by its diameter
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