Question

abc is an isosceles traingle in which ab=ac=2bc.if ad is an altitude of a traingle,prove that 4ad^2=15bc^2?

Answer 1

you can do it by trigonometry
the angle becomes 45
and tan 45 = 1
if you use this you will get the ratio of (ad and ab) and (ad and ac) then when will divide them you get the ratio of ad and bc
then just cross multiply it.
I hope this would help u.