The options are:-
(A)equilateral (B)right angled (C)isosceles (D)either isosceles or right angled
Now I took examples to get to the answer but it was wrong. The answer is (D) but I got (C). To check for right angled, I took the values $3, 4, 5$ but the LHS and RHS were different, for equilateral i used $1,1,1$ again wrong. For isosceles I took angles to be $30^\circ, 30^\circ, 120^\circ$ and one of the same sides as $10$ but this was correct, so I want to know how is (D) correct?