Q-15 Ex 6.5, Ch-6 Triangles, Class 10 Maths, In an equilateral triangle ABC, D is a point on side BC

Описание: Class 10 Maths Ch-6 Triangles, Ex 6.5
Q15. In an equilateral triangle ABC, D is a point on side BC such that BD =
(1/3)
BC. Prove that
9AD^2 = 7 AB^2