A triangle has sides with lengths of 12 meters, 35 meters, and 37 meters. Is it a right triangle?
If this is a right triangle we can then substitute the sides of the triangle (12 and 35) and the hypotenuse (37) into the Pythagoras Theorem and the two sides of the equation will be equal. If this is not a right triangle the two sides of the equation will not be equal.
The Pythagoras Theorem is
Substituting we get:
Because these are equal this is a right triangle.