It is the formula for finding the surface area of a sphere which is 4*pi*radius2
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3/2+8-pix2
Area of a circle in square units = pi*radius2
area = 225 pi = pi R squared/4 R = square root 900 = 30 in
C = 2*pi*r 8 = 2*pi*r 4 = pi*r r = 4/pi
pi squared is 9.869604401... pi cubed is 31.00627668
The area of a coil is calculated by pi r squared x length.