Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions for Mathematics

Total number of regular polyhedra is ______.

A regular polyhedron is a solid made up of ______ faces.

A polyhedron can have 3 faces.

A polyhedron with least number of faces is known as a triangular pyramid.

Regular octahedron has 8 congruent faces which are isosceles triangles.

Every solid shape has a unique net.

How many faces, edges and vertices does a pyramid have with n sided polygon as its base?

In the given figure, identify the different shapes involved.

What figure is formed if only the height of a cube is increased or decreased?

Use isometric dot paper to draw figure.

A tetrahedron

Use isometric dot paper to draw figure.

A rectangular prism with length 4 units, width 2 units and height 2 units.

If we subtract –3x²y² from x²y², then we get ______.

Subtract:

5a²b²c² from –7a²b²c²  

Subtract:

6x² – 4xy + 5y² from 8y² + 6xy – 3x² 

Subtract:

2ab²c² + 4a²b²c – 5a²bc² from –10a²b²c + 4ab²c² + 2a²bc² 

Subtract:

3t⁴ – 4t³ + 2t² – 6t + 6 from – 4t⁴ + 8t³ – 4t² – 2t + 11

Subtract:

2ab + 5bc – 7ac from 5ab – 2bc – 2ac + 10abc

Subtract:

7p(3q + 7p) from 8p(2p – 7q)

Subtract:

–3p² + 3pq + 3px from 3p(– p – a – r)

Multiply the following: 

(pq – 2r), (pq – 2r)