The diameter of a solid sphere is $14 \, cm$. Find its surface area in $cm^2$.

The radius of a sphere is $3.5\, cm$. Find the cost of plating gold on its surface at the rate of ₹ $150$ per $cm^{2}$. (in ₹)

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

The ratio of the radii of a sphere and a hemisphere is $3:2$. Find the ratio of the surface area of the sphere to the total surface area of the hemisphere.

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

The diameter of the moon is approximately one-fourth of the diameter of the earth. Find the ratio of their surface areas.