In an equilateral triangle ABC, D is a point on side BC such that BD = 1/3 BC. Prove that 9 AD 2 = 7 AB 2

 

This question is exactly same as Ex 6.5, 15 of Chapter 6 Class 10 in the NCERT Book.

Please check the answer and video here

https://www.teachoo.com/1702/521/Ex-6.5--15---In-equilateral-triangle-ABC--D-is-a-point-on-BC/category/Ex-6.5/

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.