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:2
Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.
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Get here all the solutions of class 9 Maths Exercise 11.1 Question 2
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Video Solution:
Radius of cone r = 24/2 = 12 cm and slant height l = 21 cm
Total surface area of cone = πr(r + l)
= 22/7 × 12 × (12 + 21)
= 22/7 × 12 × 33
= 1244.57 m²
Hence, the total surface area of cone is 1244.57 m².
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