The volume of a metallic cylindrical pipe is 748 cm³. Its length is 14 cm and its external radius is 9 cm. Find its thickness.
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volume of cylinder = πr^2h=748cm^3
h=14cm
external radius =9cm
748 = 22/7*(9-t)^2*14
t^2=2186
t=46.7546789102438
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