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Verified Answer :

the formula for volume of a cylinder is pir^2h 

So reversing that, 

Volume/height/pi = 

54/6/3.14 = 2.86624203822 or 2.9 

bcalle

V = pi r^2 h
54 = 3.14 r^2 6
54 = 18.84 r^2
Divide both sides by 18.84
r^2 = 2.866
Square root both sides
r = 1.7

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