If it is a right angled triangle then the side with 28 cm is the hypotenuse. Because it is the longest side.
Also if it is a right angled triangle , then 28 square = 24 square + 10 square.
28 * 28 = 784
10 * 10 + 24 * 24 = 100 + 576 = 676
LHS not equal to RHS therefore it is not a right triangle
