# Which amongst the following is not a polyhedron?

(a)

(b)

(c)

(d)

**Solution:**

We have to find a figure which is not a __polyhedron__.

A solid is a polyhedron if it is made up of only polygonal faces, the faces meet at edges which are __line segments__ and the edges meet at a point called vertex.

We observe that the figures in option a, b and d, consist of faces, vertices and edges.

In figure c, the faces are not polygons and there is a circular base.

It is a two dimensional figure.

Therefore, the figure c is not a polyhedron.

**✦ Try This: **Which amongst the following is not a polyhedron?

(a)

(b)

(c)

(d)

**☛ Also Check: **NCERT Solutions for Class 8 Maths Chapter 10

**NCERT Exemplar Class 8 Maths Chapter 6 Problem 1**

## Which amongst the following is not a polyhedron?

**Summary:**

Option (c) is not a polyhedron.

**☛ Related Questions:**

- Which of the following will not form a polyhedron? (a) 3 triangles, (b) 2 triangles and 3 parallelog . . . .
- Which of the following is a regular polyhedron? (a) Cuboid, (b) Triangular prism, (c) Cube, (d) Squa . . . .
- Which of the following is a two Dimensional figure? (a) Rectangle, (b) Rectangular Prism, (c) Square . . . .

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