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Question

The slant height of a right circular cone is 10cm and its height is 8cm, then the area of its curved surface is:
  1. 80πcm2
  2. 60πcm2
  3. 65πcm2
  4. 70πcm2

A
80πcm2
B
60πcm2
C
70πcm2
D
65πcm2
Solution
Verified by Toppr

Given, slant height of a right circular cone, l=10cm
and its height, h=8cm.

Then the radius of the cone will be,
r2=l2h2=(10)2(8)2=10064=36r=6cm

Therefore, the curved surface area of right circular cone,
C.S.A of a cone =πrl=π×6×10=60πcm2

Hence, option B is correct.

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