Question

In an equilateral triangle abc d is a point on side bc such that 4bd=bc prove that 16ad^2=13bc^2

Answer 1

that 4BD=BC. Prove that 16AD2=13BC2. ... In an equilateral triangle ABC, D is a point on side BC such that 4BD=BC. Prove that ... Putting the value of AE² from (2) in (1), we get