Question

9. Draw the figures and nets of the following polyhedrons:
(a) Cube
(b) Cuboid
(c) Triangular prism
(d) Tetrahedron (e) Octahedron 9 Dodecahedron
In the figure given below three nested solids are piven Name the​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

NCERT Exemplar Class 8 Maths Chapter 6 Visualising Solid Shapes

April 24, 2019 by Sastry CBSE

NCERT Exemplar Class 8 Maths Chapter 6 Visualising Solid Shapes are part of NCERT Exemplar Class 8 Maths. Here we have given NCERT Exemplar Class 8 Maths Chapter 6 Visualising Solid Shapes.

NCERT Exemplar Class 8 Maths Chapter 6 Visualising Solid Shapes

Multiple Choice Questions

Question. 1 Which amongst the following is not a polyhedron?

ncert-exemplar-problems-class-8-mathematics-visualising-solid-shapes-1

Solution.

(c) According to the definition of a polyhedron, option (c) figure does not satisfies the condition of a polyhedron.

Since, a solid is a polyhedron if it is made up of only polygonal-faces, the faces meet at edges with one line segment and the edges meeting at a point. The point is generally called as vertex. But all the faces of option (c) are not polygons, there is a

circular base, so the figure is not a polyhedron.

Question. 2 Which of the following will not form a polyhedron?

(a) 3 triangles (b) 2 triangles and 3 parallelograms

(c) 8 triangles (d) 1 pentagon and 5 triangles

Solution.

(a) A polyhedron is bounded by more than four polygonal faces. But in case of 3 triangles, it is not possible. So, option (a) does not form a polyhedron.

Question. 3 Which of the following is a regular polyhedron?

(a) Cuboid (b) Triangular prism

(c) Cube (d) Square prism

Solution.

(c)