Question

Hou many small sphere of radius 2cm can be formed by melting a ball of iron of radius4cm tick the correct answer
​

Answer 1

Answer:

128

Step-by-step explanation:

Volume of iron =

3

4

πR

3

=

3

4

π(4)

3

=

3

4

π[64] cm

3

Volume of small sphere =

3

4

π(r)

3

=

3

4

π(2)

3

=8(

3

4

π) cm

3

no. of small spheres that can be formed =

volume of small sphere

volume of big iron

=

8(4/3π)

64(4/3π)

=8

∴ 8 small spheres can be formed.

Surface area of the spheres formed =8×(4πr

2

)

=8×(4π)(4)

=128π cm

2

please mark me as brainliest