a hollow cylinder, 21cm in hieght has an inner radius of 7cm and thickness of 7cm. find the tsa
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Since the cylinder is melted and cone is formed , the volume of both will be the same.
i.e. volume of hollow cylinder = volume of cone
π((3+0.5)
2
−(3)
2
)×21=
3
1
×π×R
2
×7
7
21×3
((3.5)
2
−3
2
=R
2
(3×3)(3.5+3)(3.5−3)=R
2
R=3
6.5×0.5
R=3
10
65
×
10
5
=
10
3
13×5×5
=
10
15
13
R=5.4cm
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