NCERT Class 9 Solutions: Triangles (Chapter 7) Exercise 7.1 – Part 3

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Angle Angle Side congruence condition

Give Angle Angle Side congruence condition of ΔENR and ΔRNV

Give Angle Angle Side Congruence Condition

Q-5. Line l is the bisector of an angle and B is any point on l. BP and BQ are perpendiculars from B to the arms of (see Fig). Show that:

  1. or B is equidistant from the arms of

Angle a and B is Any Point on L

Solution:

Give, l is the bisector of an angle

BP and BQ are perpendiculars.

  1. In and

(Right angles)

(l is bisector)

(Common line)

Therefore, (by Angle-Angle-Side congruence condition).

  1. by Corresponding Part of Congruent Triangles.

Therefore, B is equidistant from the arms of .

Q-6 In the Figure. , . Show that

Point of a,B,C,D,E ,∠BAD = ∠EAC

Solution:

Given,

To show,

Proof,

(Adding ∠DAC both sides)

In and

(Given)

(Given)

Therefore, (by Side-Angle-Side congruence condition).

(By Corresponding Part of Congruent Triangles)