A given triangle to be right-angled, if it satisfies Pythagorean Theorem. That is, the sum of the squares of the two smaller sides must be equal to the square of the largest side.
1 cm, 24 cm, 25 cm
Longest side = 25 cm
(25)2 = 625
and (7)2 x (24)2 = 49 + 576 = 625
625 = 625
It is a right triangle.
