Verified Answer :

SoccerAllStar2

I believe it would be the 3rd one. (r=41/2) which is (radius=diameter/2)
~Hope This Helps~

The radius is always half the diameter so since diameter here is 41 we must divide by two so 41/2=20.5 20.5 is the radius. So the option \(\frac{41}{2}\) is the right one

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