pi is the constant value that was given by ARYABHATTA was 3.141 and here "r" is nothing but radius
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2 x Pi x r is equal to the circumference of a circle whose radius is equal to r.
No. 2Pi r is equal to Pi d, though.
area of a circle is equal to pi times the square of its radius.. A=(pi)r^2
A cylinder of radius R and length L has a surface area equal to: Area = Area of 2 Circular Faces + Area of Tube = 2 * Pi * R2 + 2 * Pi * R * L Area = 2 * Pi * R * (R+L) where Pi = 3.14 (rounded) Another way to look at it is: 2 * Pi * R2 + Pi * d * h. H= height R= radius D= diameter 2= squared
Pi times r times r or Pi r squared is the formula for finding the area of a circle where r is the radius