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Divakar Pandey
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Asked: 2020-11-05T03:20:34+00:00 In:

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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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

2020-2021cbsechapter 13class 9mathematicsncertsurface areas and volumes
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    3 Answers

    1. Best Answer

      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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    2. Get Hindi Medium and English Medium NCERT Solution for Class 9 Maths to download.
      Please follow the link to visit website for first and second term exams solutions.
      https://www.tiwariacademy.com/ncert-solutions/class-9/maths/chapter-13/

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    3. Get here all the solutions of class 9 Maths Exercise 11.1 Question 2
      https://www.tiwariacademy.com/ncert-solutions/class-9/maths/chapter-11/
      Video Solution:

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