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Pythagorean Theorem
The Pythagorean Theorem relates the three sides of a right triangle. A right triangle is a triangle in which one of the angles is a right angle (a 90-degree angle). The side of the triangle that is opposite to the right angle is called hypotenuse. Any of the other two side can be named 'base'(b) and the 'perpendicular/height(a)'. The angle opposite to the base(b) is denoted by 'B' and the one opposite to perpendicular'A'. By this the angle C is 90 degrees and is known as a right triangle.
A right triangle can only be isosceles or scalar. Never equilateral.
Let c be the length of the hypotenuse, a and b the length of the other sides.
The theorem states:
c2 = a2 + b2
Whenever you are given two sides of a right triangle, you can calculate the third one using the Pythagorean Theorem.