The ratio between the curved surface area and the total surface area of a right circular cylinder is 1 : 2 . if the total surface area of cylinder is 616 eq.cm, then find its volume
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Given that:Curved surface area : Total surface area =1:2
Curved surface area :616=1:2
Curved surface area=
2
616
=308
⇒
2πr(h+r)
2πrh
=
2
1
⇒
h+r
h
=
2
1
⇒2h=h+r
⇒h=r
Curved Surface area=2πrh=2πr
2
=308 since h=r
⇒2×
7
22
r
2
=308
⇒r
2
=
44
308×7
=49
⇒r=7cm
Since r=h
h=7cm
Volume of the cylinder=πr
2
h=
7
22
×7×7×7=1078cm
3
∴ Volume of the cylinder is 1078 cu cm.
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Answer:
Volume of cylinder is 1072 cubic meters.
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