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The front compound wall of a house is decorated by wooden spheres of diameter 21 cm, placed on s...

3,218 views · Published 20 July 2018 · 7:34 · Indexed 21 September 2026

Channel: Doubtnut · 2018 · Education

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Question From - NCERT Maths Class 9 Chapter 13 EXERCISE 13.9 Question – 2 SURFACE AREAS AND VOLUMES CBSE, RBSE, UP, MP, BIHAR BOARD

QUESTION TEXT:-
The front compound wall of a house is decorated by wooden spheres of diameter 21 cm, placed on small supports as shown in Fig 13.32. Eight such spheres are used for this purpose, and are to be painted silver. Each support is a cylinder of radius 5cm and height 7cm and is painted black.Find the cost of paint required if silver paint cost 25 paisa per `cm^2` and black paint cost 5 paisa per `cm^2`

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Related Questions & Solutions:

1. A wooden bookshelf has external dimensions as follows: `H e igh t\\ =\\ 110\\ c m` , `D e p t h\\ =\\ 25\\ c m` , `B r e a dt h\\ =\\ 85\\ c m` (see Fig. 13.31). The thickness of the plank is 5 cm eve...
https://youtu.be/6b_xiVPQz0M

2. The diameter of a sphere is decreased by 25%. By what per cent does its curved surface area decrease?...
https://youtu.be/y5ejX6liywc

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• NCERT Solutions for Class 9, Chapter 13 - https://doubtnut.com/ncert-solutions/class-9-maths-chapter-13-surface-areas-and-volumes-1


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