Find the diameter of base of cylinder, if its height is 1.2 metre and its curved surface area is 31680 square centimetre.
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Find the diameter of base of cylinder, if its height is 1.2 metre and its curved surface area is 31680 square centimetre.
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Answer:
Given: Diameter of base of cylinder =14 cm.
∴ Radius (r)=
2
14
=7 cm.
and Height of cylinder is h=20 cm.
So, Surface area of cylinder =2πr(r+h)
=2×
7
22
×7(7+20)
=44×27
Surface area of cylinder =1188 sq.cm.
Volume of cylinder =πr
2
h
=
7
22
×7
2
×20
=22×7×20
Volume of cylinder=3080 cu.cm