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The perimeter is both on the outside and the inside of a shape, pg slot as it is basically the outside wall/border of a shape and can therefore be viewed from the outsi
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Math and Arithmetic



+2









What is the circumference of a circle if its area is 81π?


Asked by Anonymous



C = 81 pi = 2pi r

Hence

2 pi r = 81pi

r = 81 pi / 2 pi

Cancel down

r = 40.5

A = pi r^(2)

A = pi ( 40.5)^(2)

A = 1640.25 pi units^(2)