A plumbline (sahul) is the combination of 

A cone is cut by a plane, parallel to its base and the upper part is removed. The part that is left over is called 

A solid piece of iron in the form of a cuboid of dimensions $49 \mathrm{cm}\times 33 \mathrm{cm}\times 24 \mathrm{cm}$ is moulded to form a solid sphere. The radius of the sphere is 

Use $\left(\pi =\frac{22}{7}\right)$

A rectangular sheet of paper $40 \mathrm{cm} \times 22 \mathrm{cm}$, is rolled to form a hollow cylinder of height $40 \mathrm{cm}$. The radius of the cylinder $($in $\mathrm{cm})$ is,