Answers about Geometry
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The perimeter is both on the outside and the inside of a shape, 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 pg slot 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)
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