Question

two solid hemisphere of the same base radius R are joined together along their base then curved surface area of this new solid is ​

Answer 1

Answer:

Because curved surface area of a hemisphere is 2 w2 and here, we join two solid hemispheres along their bases of radius r, from which we get a solid sphere. Hence, the curved surface area of new solid = 2 πr2 + 2 πr2 = 4πr2.