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

The surface area of a sphere is $5544 \, cm^2$. Find its volume in $cm^3$.

Find the curved surface area and the total surface area of a hemisphere with a radius of $2.1 \, m$.

In the auditorium,there are $20$ cylindrical pillars. Each pillar has a radius of $14 \, cm$ and a height of $5 \, m$. Find the cost of painting the curved surface of all the pillars at the rate of ₹ $120$ per $m^2$.

The dimensions of a cuboid are in the ratio of $4: 3: 1$. If its total surface area is $3800 \, cm^{2}$,then find its volume in $cm^{3}$.

Find the curved surface area and the total surface area of a hemisphere with a diameter of $2.8\,m$.