In mathematics, the Pythagorean theorem, also known as Pythagoras's theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides.
This tool gives a visual demonstration by allowing a right angled triangle to have its sides changed and then the areas of the two squares on the smaller sides be dragged into the square on the hypotenuse.
