NCERT Solutions for Class 9 Maths Chapter 13
Important NCERT Questions
Surface Areas and Volumes
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 13.3
Page No:221
Questions No:1
Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.
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Video Solution:
Radius of cone r = 10.5/2 = 5.25 cm and slant height l = 10 cm
Curved surface area of cone = πrl
= 22/7 × 5.25 × 10
= 22 × 0.75 × 10
= 165 cm²
Hence, the curved surface area of cone is 165 cm².
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