What type of faces does a sphere have?

The figure of a square sheet paper is shown below. Length of one side of the paper sheet is $36 \mathrm{cm}$ and $AB=10 \mathrm{cm}$. The shaded portion is cut out and folded into a square pyramid. If the length of the base of the pyramid is $k \mathrm{cm}$, find $k$.

The picture shows the shape of a boiler. Total height of the boiler is $12$ metres and the diameter is $6$ meters, height of the cylindrical part is $6$ meters.

What is the height of the cone?

On the basis of the given figure, the length of a rectangle in the net of a cylinder is same as circumference of circles in its net.

The total number of vertices in a cylinder is/are _____.$(0/1/4/8)$

The given shape is a cylinder.

The number of rectangular faces in a cuboid is  ----------.