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If a cylinder of radius 4.3 cm and height 4.8 cm is melted and constructed into a cone of the same radius, what will be the height of this cone? (Use π=22/7)

  1. A
    28.8 cm
  2. B
    14.4 cm
  3. C
    7.2 cm
  4. D
    21.6 cm

Solution & Step-by-step Explanation

When a solid is melted and recast into another shape, its volume remains the same.
Volume of Cylinder=Volume of Cone
The formula for the volume of a cylinder is πr
2
h
1

and for a cone is
3
1

πr
2
h
2

.
Given that they have the same radius r:

πr
2
h
1

=
3
1

πr
2
h
2


We can cancel πr
2
from both sides:

h
1

=
3
1

h
2


h
2

=3×h
1


Given that the height of the cylinder h
1

=4.8 cm:

h
2

=3×4.8=14.4 cm
Thus, the height of the cone will be 14.4 cm.

Practice this question

Try it yourself before checking the explanation above.

If a cylinder of radius 4.3 cm and height 4.8 cm is melted and constructed into a cone of the same radius, what will be the height of this cone? (Use π=22/7)
A
28.8 cm
B
14.4 cm
C
7.2 cm
D
21.6 cm

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