SOLUTION: what does mean 9pi square units? what is the length of the diameter of a circle with an area of 9 pi square units?

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Question 894055: what does mean 9pi square units? what is the length of the diameter of a circle with an area of 9 pi square units?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
A=pi%2Ar%5E2
A is for area
r is for radius
d is for diameter
d=2r, according to definition of diameter.

You are given A and you want to find d.

pi%2Ar%5E2=A
pi%2A%28d%2F2%29%5E2=A
%28d%2F2%29%5E2=A%2Fpi
d%2F2=sqrt%28A%2Fpi%29
highlight%28d=2%2Asqrt%28A%2Fpi%29%29

The problem description already gave you the value for A.