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

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?

Name the $3$-D objects or shapes that can be formed from the following nets.

Draw the following diagram on the check ruled book and find out whether the following diagrams makes cube or not.

Name the $3$-D object or shape that can be formed from the following net.

Complete the following table

Name the solid object which has no vertex?

Is a square prism and cube are same? Explain.

Name the $3$-D object or shapes that can be formed from the following nets.

Can a polyhedron have $4$ triangular faces only? Explain.

Name the $3$-D objects or shapes that can be formed from the following nets.

Name the $3$-D objects or shapes that can be formed from the following nets.

Name the $3$-D objects or shapes that can be formed from the following nets.

Write the names of the objects given below.

Can a polyhedron have $3$ triangular faces only? Explain.