Question taken from RD sharma
Chapter no. 4
Chapter name:- Triangles
Exercise :- 4.3
This is very basic and important questions.
In this question we have a ∆ABC, AD is the bisector of ∠A, meeting side BC at D.
Also sides measurements are given AB = 3.5 cm, AC = 4.2 cm and DC = 2.8 cm,
Now have to find BD
Understanding and learning CBSE maths
RD sharma, DHANPAT RAI publication