Question

a metallic sphere of radius 4cm is melted and recast into a cylinder of radius 6cm find height of cylinder​

Answer 1

Step-by-step explanation:

Given:

Radius (r1 ) of hemisphere =4.2 cm

Radius (r

2) of cylinder =6 cm

Height (h) = ?

The object fromed by recasting the hemisphere will be same in volume.

So, Volume of sphere = Volume of cylinder

3

4

πr

1

3

=πr

2

2

h

⟹

3

4

π×(4.2)

3

=π(6)

2

h

⟹

3

4

×

36

4.2×4.2×4.2

=h

h=(1.4)

3

=2.74 cm

Therefore, the height of cylinder so formed will be 2.74 cm.