Question

If two solid hemi-spheres of same base radius r are joined together along their base, then find the total surface area of this new solid.

Answer 1

HEMISPHERE:
A plane passing through the centre, cuts the sphere in two equal parts each parts, each part is  called a hemisphere.

SPHERE:
A sphere is a solid generated by the revolution of a semicircle about its diameter.

SOLUTION:
When two solid hemispheres of same base radius 'r' are joined along their baseit forms a sphere.
Surface area of Sphere= 4πr²

Hence, the total surface area of new solid (SPHERE) is 4πr².

HOPE THIS WILL HELP YOU...

Answer 2

Hey!

Here is ur answer

When u will join two hemisphere, It will form a sphere

And the TSA of sphere is

$4\pi {r}^{2}$

HOPT IT HELPS U