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/

  1. Class 10
  2. Solutions of Sample Papers for Class 10 Boards

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.