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Question

The radius of the base of a right circular cone is 21 cm and its height is 20 cm. Find its volume.


A
3300 cm2
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B
1914 cm2
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C
1386 cm2
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D
26720 cm2
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Solution

The correct option is B 1914 cm2

Given: Radius of the cone, r = 21 cm
            Height of the cone, h = 20 cm
Volume of cone = 13πr2h
                          = 13×227×21×21×20
                          = 22×21×20
                          = 9240 cm3

Mathematics

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