If one angle equals 90 degrees and the others are less than that and they all add up to 180 degrees
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there will be a right angle in the triangle.
If one of the angles in a triangle is exactly 90 degrees, then it is a right-angle triangle.
Pythagoras's Theorem is used to determine if a triangle is a right triangle or not.
If the length of only one side is known, it is not possible to determine whether or not the triangle is right angled.
Well, when the slopes of the perpendicular sides of the right triangle are mutiplied, the result should be -1.