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Gopinath Munde
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Asked: 2020-11-04T11:14:13+00:00 In:

A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm. Find the volume of the solid so obtained.

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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 13.7
Page No:233
Questions No:7

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

    1. 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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    2. Best Answer
      A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm. Find the volume of the solid so obtained.

      If the triangle is revolved about 12 cm side, a cone will be formed. Therefore, the dadius of cones r = 5 cm height h = 12 cm and slant height l = 13 cm.
      Volume of solid (cone) = 1/3πr²h = 1/3 × π × 5 × 5 × 12 = 100π cm³
      Hence, the volume of solid is 100π cm³.

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    3. If the triangle is revolved about 12 cm side, a cone will be formed. Therefore, the dadius of cones r = 5 cm height h = 12 cm and slant height l = 13 cm.
      Volume of solid (cone) = 1/3πr²h = 1/3 × π × 5 × 5 × 12 = 100π cm³
      Hence, the volume of solid is 100π cm³.

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