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The area of one piece of pizza is 9π in2 . The pizza is cut into eighths. What's the radius of the pizza pie? 

 Apr 14, 2014
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The area of one piece of pizza is 9π in2 . The pizza is cut into eighths. What's the radius of the pizza pie? 

Well.....if 9π in2 represents 1/8 of the area, then the total area must be 8 times as much...i.e., 72π in2

So we have that the area of a circle is given by......  A = πr2

Therefore

72π in2 = πr2

Dividing by pi on each side, we have

72 in2 = r2

Taking the square root of both sides, we have   

 

r = √(72)in = 6√(2) in

 Apr 14, 2014

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