In  . 

The correct answer is: Hence proved

Solution :-
Aim  :- Prove that 
Hint :- Using pythagoras theorem in triangle ABC we get relation between a, b and c
Now , using the relation between a, b, c and h found from the area of the triangle, substitute the value of c in terms of a, b and h to get the required relation.
Explanation(proof ) :-
Area of triangle ABC =  × base × height
Area of triangle taking AC as base =  ×  ab
Area of triangle taking AB as base = × c h
As area of triangle ABC is constant so, we get  ab = ch 
Applying pythagoras theorem in ABC ,we get
                                                                                                                    
Substitute  in the above equation

Hence proved