Find the surface area of a sphere of radius $7 \, cm$. (in $, cm^{2}$)

The radius of a sphere is $14 \, cm$. Find its surface area (in $cm^2$).

Find the curved surface area and the total surface area of a hemisphere with a radius of $14\, cm$.

Find the radius of a sphere whose surface area is $154 \, cm^2$. (in $, cm$)

Find the surface area of a sphere of diameter $49\, cm$ (in $cm^2$).

$A$ hemispherical metallic bowl is made of steel,$0.2 \, cm$ thick. The inner radius of the bowl is $4 \, cm$. Find the outer curved surface area of the bowl (in $cm^2$).