Question drawn from very renowned book RD sharma of class 10th, Chapter no. 4

Chapter name:- Triangles

Exercise :- 4.3

This is very important question of triangle.

In this question ques we have been given the measure of sides of triangle ABC and we have to to find out if AD is Angle bisector of A or not. By using triangles properties

learning CBSE maths in efficient way

RD sharma, DHANPAT RAI publication

Class 10th, triangle

AB=5cm

AC=12cm

BD=2.5cm

BC=9=BD+DC=2.5+DC

CD=6.5cm

ACAB=125≈0.42 (1)

CDBD=6.52.5≈0.38 (2)

(1)=(2)

Hence AD is not the bisector of ∠A of △ ABC