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Question
The radius of the base of a solid cone is 21 cm and its height is 9 cm. What is the volume of the cone?
एक ठोस शंकु के आधार की त्रिज्या 21 सेमी और उसकी ऊँचाई 9 सेमी है। शंकु का आयतन क्या है?
A.
1980 cm3
B.
4158 cm3
C.
1386 cm3
D.
5940 cm3
Answer ( Option B)

4158 cm3

Solution

दिया गया है:
=आधार की त्रिज्या (r) = 21 सेमी
= ऊँचाई (h) = 9 सेमी
=शंकु का आयतन (V) = 1/3πr²h
=प्रयुक्त सूत्रः
v=1/3πr²h
v=1/3π(21)²(9)
v=1/3π(144) (9)
v=π(3969)
v=4158cm3
 
 

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