Question

If you have the length of each side, apply the Pythagorean theorem to the triangle. If you get a true statement when you simplify, then you do indeed have a right triangle! If you get a false statement, then you can be sure that your triangle is not a right triangle

Answer 1

Pythagoras theorem is used for to find the side of a right triangle. but for this one should be 90degree then we can use Pythagoras theorem.