# Class 7 Maths Chapter 6 Exercise 6.2 Pdf Notes NCERT Solutions

Class 7 Maths Chapter 6 The Triangles And Its Properties Exercise 6.2 pdf notes:-

Exercise 6.2 Class 7 maths Chapter 6 Pdf Notes:-

## Ncert Solution for Class 7 Maths Chapter 6 The Triangles And Its Properties Exercise 6.2 Tips:

ANGLE SUM PROPERTY OF A TRIANGLE
There is a remarkable property connecting the three angles of a triangle. You are going to
see this through the following four activities.

1. Draw a triangle. Cut on the three angles. Rearrange them as shown in (i), (ii).
The three angles now constitute one angle. This angle is a straight angle and so has
measure 180°.

Thus, the sum of the measures of the three angles of a triangle is 180°.

1. The same fact you can observe in a different way also. Take three copies of any
triangle, say ΔABC

Arrange them as in
What do you observe about ∠1 + ∠2 + ∠3?
(Do you also see the ‘exterior angle
property’?)

1. Take a piece of paper and cut out a triangle, say, ΔABC (Fig 6.16).
Make the altitude AM by folding ΔABC such that it passes through A.
Fold now the three corners such that all the three vertices A, B and C touch at M.

You find that all the three angles form together a straight angle. This again shows that
the sum of the measures of the three angles of a triangle is 180°.

1. Draw any three triangles, say ΔABC, ΔPQR and ΔXYZ in your notebook.
Use your protractor and measure each of the angles of these triangles.