Pythagorean Theorem probably is the best-known theorem in geometry, which gives the relationship between the lengths of sides of a right-angled triangle.

Pythagorean Theorem states that: “In a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of perpendicular and base.”

i.e. h2 = p2 + b2

This Pythagorean relation is widely used in mathematics, physics, astrology, geology, engineering, etc.