NCERT Class 8 Mathematics Solutions: Chapter 10 – Visualising Solid Shapes Exercise 10.3 Part 1

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Figure and its name

Figure and Its Name

Figure and its name

Question 1:

Can a polygon have for its faces

(i) 3 triangles?

(ii) 4 triangles?

(iii) A square and four triangles?

Answer:

(i) No, a polyhedron cannot have 3 triangles for its faces. A polyhedron has minimum 4 faces.

(ii) Yes, a triangular pyramid has 4 triangular faces.

(iii) Yes, a square pyramid has a square face and 4 triangular faces.

Question 2: Is it possible to have a polyhedron with any given number of faces?

Answer:

It is possible, a polyhedron has a minimum 4 faces.

Question 3: Which are prisms among the following?

(i)

Image of a Nail

Image of a Nail

Image of a Nail

A nail

(ii)

Image of an Unshapened pencil

Image of an Unshapened Pencil

Image of an Unshapened pencil

Unsharpened pencil

(iii)

Image of a Table Weight

Image of a Table Weight

Image of a Table Weight

A table weight

(iv)

Image of a Box

Image of a Box

Image of a Box

A box

Answer:

Figure (ii) unsharpened pencil and figure (iv) a box are prisms.

Prism shapes are given

Prism Shapes Are Given

Prism shapes are given