Draw a figure of regular octahedron and write the number of faces, vertices and edges.

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?

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 $3-\mathrm{D}$ shape of _____ does not have a vertex.

The given net can be folded to make a _____. (Prism/Cuboid)

A pentagonal prism has _____ faces.

A cuboid has _____ pairs of identical faces. (one/two/three/four)

In the figure, the number of faces meeting at $B$ are _____.

Choose the correct answer and fill the blanks.

Solid shapes require _____ dimensions to describe them. [two/three]

In a cuboid, there are $6$ rectangular faces, _____ edges and $8$ vertices.

A solid obtained on rotating a right triangle about one of its legs produces _____. (Right circular cone/ Right circular cylinder/Sphere/ Tetrahedron)

Cubes, cylinders, cones, shapes etc., are called _____ figures. [$2-\mathrm{D}$/$3-\mathrm{D}$]