how do you find the area of a circle?
A = Area
r = radius
d = diameter
A = r ^ 2 pi
OR
r = d / 2
A = r ^ 2 pi = ( d / 2 ) ^ 2 * pi = ( d ^ 2 / 4 ) * pi = d ^ 2 pi / 4
r = radius
d = diameter
A = r ^ 2 pi
OR
r = d / 2
A = r ^ 2 pi = ( d / 2 ) ^ 2 * pi = ( d ^ 2 / 4 ) * pi = d ^ 2 pi / 4