) Surface area of a solid hemisphere is 30cm2 . Two such hemispheres arejoined to get a sphere.What is the total surface area of the sphere so formed

To find the total surface area of the sphere formed by joining two solid hemispheres, we can use the formula for the surface area of a sphere.

The surface area of a sphere is given by the formula: A = 4πr^2, where A is the surface area and r is the radius of the sphere.

In this case, we are given that the surface area of one solid hemisphere is 30 cm^2. Since a hemisphere is half of a sphere, we can find the surface area of the whole sphere by doubling the surface area of the hemisphere.

So, the surface area of the whole sphere is 2 * 30 cm^2 = 60 cm^2.

Therefore, the total surface area of the sphere formed by joining two solid hemispheres is 60 cm^2.