From a solid cylinder of height 20 cm and diameter 12 cm , a conical cavity of height 8 cm and diameter 12 cm is hollowed out . Find T.S.A. of remaining solid.
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TSA=2πr(h+r)
=2*22/7*12(28+12)
=44/7*12*40
=528/7*40
=21120/7
=317.07
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