To find out if it is a right-angled triangle check if Pythagoras’ theorem is true for the lengths of the sides. This triangle looks like a right-angled triangle, but it might not be. To find out ...

16~\text{cm}^\text{2}\) This is Pythagoras' theorem. Pythagoras' theorem states that, in any right-angled triangle, the square of the hypotenuse is equal to the sum of the squares on the other two ...