Section - D
15. Diameter of cylinder A is 7 cm, and the height is 14 cm. Dimensions of cuboid
B are 12 cm x 8 cm x 4 cm. Verify whose volume is greater and also verify which
has greater surface area?
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Step-by-step explanation:
Correct option is
B

In volume of cylinder, the radius is multiplied by squaring it.
∴ Volume of cylinder B will be more than that of A
Volume of cylinder A
Radius(r)=27 cm
Height(h)=14 cm
∴Volume of cylinder A=πr2h
=722×(27)2×14cc
=11×7×7=539cc
Volume of cylinder B
Radius(r)=214 cm=7 cm
Height(h)=7 cm
∴Volume of cylinder B=πr2h
=722×(7)2×7cc
=22×7×7=1078cc
Thus, cylinder B has greater volume.
Now, Surface area of cylinder A=2πr(r+h)
=2×722×27(27+14)
=22×2
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