Question

The volume of a cylinder is 69300cm3and its height is 50cm.find its curved surface area

Answer 1

given volume of cylinder =69300cm
hight =50cm
SO according to formula
volume of cylinder =2/\rh
so by applyingit
69300=2×22/7×50×r
r=
$69300 \div 2 \times 7 \div 22 \times 1 \div 50 \\ = 220.5$
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Answer 2

volume of a cylinder=1/3pai r2h
69300=1/3×22/7×r2×50
69300×3×7/22×50=r2
3150×21/50=r2
63×21=r2
r2= 1326
r=36

now
curved surface area of a cylinder=2×22/7r×h
2×22/7×36×50
=2200×36/7
= 79200/7
=11314.28sq cm


HOPE IT HELPS U MATE