Question

What is the Curved Surface area of Hollow hemisphere?

Answer 1

πr² is the formula to find the area.

Answer 2

Answer:

Let the outer radius of the hollow hemisphere be R and the inner is r.

Then, outer c.s.a = 2piR^2 and inner c.s.a. = 2pir^2

Therefore, c.s.a. of the hollow hemisphere = outer c.s.a.+inner c.s.a

= 2piR^2 + 2pir^2

= 2pi(R^2 + r^2)