3 years ago

Type your questiona circle has a diameter of 81 pie square units. what is the diameter of the circle?

1 answer:

7 0

I think your question should read "A circle has an AREA of 81 PI square units...)
Circle Area = PI * radius^2
81 PI = PI * radius ^2
radius^2 = 81 PI / PI
radius^2 = 81
radius = 9
Therefore circle diameter = 9 * 2 = 18

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