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A circle with center A and radius three inches is tangent at to a circle with center B, as shown. If point B is on the small circle, what is the total perimeter of the shaded region? Express your answer in terms of pi.

 

 

 Dec 7, 2021
 #1
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P = 18pi

 Dec 7, 2021
 #2
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DISAGREE.

We are looking for total circumference (ie perimeter) of two circles, of radii 3 and 3/2 metres

=(3^2+(3/2)^2)Pi =9+9/4=45/4 Pi= 11.25Pi

 Dec 7, 2021

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