Question

Outer surface area of a hollow
iron sphere is 1256cm? If
thickness of iron is Icm, find the
volume of air filled inside the ball.​

Answer 1

Answer:

Given : Curved surface area of a sphere =1256 cm

2

We know that, Curved surface area of a spehre =4πr

2

⟹1256=4×3.14×r

2

⟹r

2

=

4×3.14

1256

⟹r

2

=100

∴r=10 cm

Hence, the answer is 10 cm.