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Mensuration Practice Test 2
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© examsnet.com
Question : 7
Total: 40
The height of a circular cylinder is increased six times and the base area is decreased to one-ninth of its value. The factor by which the lateral surface of the cylinder increased is:
2
1
2
2
3
3
2
Validate
Solution:
👈: Video Solution
Lateral surface area of the cylinder = 2πrh
Area of the base =
π
r
2
=
9
(
π
r
2
)
r
2
=
9
R
2
r
2
9
=
R
2
R =
r
3
Height of the cylinder H = 6h
New lateral surface area = 2π RH
=
2
π
(
r
3
)
6
h
= 4πrh
New lateral surface area is two times.
© examsnet.com
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