Question

a solid sphere of diameter 10 cm is melted to form two solid hemisphere and one sphere their having the same diameter find the value of the diameter of the sphere and the hemisphere​

Answer 1

Answer:

We know that,

Curved surface area of a hemisphere =2πr2

So, when two solids hemispheres of same base radius are joined together along their bases, then

Curved surface area of newly formed solid sphere=2×2πr2=4πr2