find the TSA of one side open hollow cylinder of height 70cm and internal radius is 15cm and thickness is 2cm.
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given
inner radius(R)=15cm
thickness=2cm
height=70cm
To find TSA
TSA of cylinder=pie×h({(R)^2-(r)^2}
=22/7×70(17)^2-(15)^2
=220×64
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