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

There are two boxes of metal sheet. The length,width,and height of a cuboidal box are $30 \, cm$,$25 \, cm$,and $20 \, cm$ respectively. $A$ cubical box has each edge of $25 \, cm$. Find out which box requires more metal sheet and by how many $cm^2$?

The radius of a sphere is $2r$,then its volume will be

Find the curved surface area and the total surface area of a hemisphere with a radius of $17.5 \, cm$.

The radius and slant height of a conical vessel are $21 \,cm$ and $29 \,cm$ respectively. What is its capacity in litres?

Find the volume of a sphere whose surface area is $1256 \, cm^{2}$. (Use $\pi = 3.14$)