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 C266.11cm3
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.