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Question

A solid wooden toy is in the shape of a right circular cone mounted on a hemisphere. If the radius of the hemisphere is 4.2cm and the total height of the toy is 10.2cm, find the volume of the wooden toy.

A
266.11cm3
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B
301.12cm3
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C
242.36cm3
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D
278.34cm3
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Solution

The correct option is C 266.11cm3
The volume of wooden toy will the volume of the right circular cone plus the volume of the hemisphere on which it is mounted.
Volume of the cone =13πr2h
Volume of the hemisphere=23πr3
Here,
r= Radius of the hemisphere or the radius of the cone ; as in this cane the cone is mounted on hemisphere so both's radius will be the same
h= Height of the cone
Given :
r=4.2cm
as the total height of the toy is 10.2cm so the height of the cone will be : this total height radius of the hemisphere.
h=10.24.2=6cm

Therefore the volume of toy V:

=13πr2h+23πr3

=13π4.22×6+23π4.23

=110.835+155.1695

266.11cm3 Ans.

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