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:5
A conical pit of top diameter 3.5 m is 12 m deep. What is its capacity in kilolitres?
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Radius of pit r = 3.5/2 = 1.75 m and height h = 12 m.
Volume of pit = 1/3πr²h
= 1/3 × 22/7 × 1.75 × 12 = 38.5 m³
= 38.5 kiloliters [∵ 1 m³ = 1 kilolitres]
Hence, the capacity of pit is 38.5 kilolitres.