Maths(Triangles) - CLASS X
In an equilateral triangle ABC, D is a point on side BC such that BD = BC/3. Prove that 9AD^2 = 7 AB^2.
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Pls refer to the attachment for detailed solution.
Things to remember while solving this type of questions :-
1) If we can't see a right angle in the figure, we should always make a perpendicular line ( 90° ) to one of the sides of a triangle. By this way , we can use Pythagoras Theorem to solve the further problem.
2) We should learn to connect one things with another .
3) We should know how to eliminate the terms which we do not need in our answer by substituting them with other values.
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