# A conical pit of top diameter 3.5 m is 12 m deep. What is its capacity in kilolitres? - Mathematics

A conical pit of top diameter 3.5 m is 12 m deep. What is its capacity in kilolitres?

["Assume "pi=22/7]

#### Solution

Radius (r) of pit = (3.5/2)m = 1.75 m

Height (h) of pit = Depth of pit = 12 m

"Volume of pit "=1/3pir^2h

=[1/3xx22/7xx(1.75)^2xx12]cm^3

= 38.5 m3

Thus, capacity of the pit = (38.5 × 1) kilolitres = 38.5 kilolitres

Concept: Volume of a Right Circular Cone
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#### APPEARS IN

NCERT Class 9 Maths
Chapter 13 Surface Area and Volumes
Exercise 13.7 | Q 5 | Page 233