Hi Varshini,
If in a triangle, there is one angle 90, we use Pythagoras Theorem.
Also, if we know 1 or 2 sides a triangle, and we need to find the 3rd side, we check if we can apply Pythagoras theorem. So, we check if one angle of a triangle is 90 and then apply Pythagoras.
Written on March 30, 2017, 11:32 a.m.