Pythagorean Theorem

 

 

 







The Pythagorean Theorem states that the square of the hypotenuse of a right triangle is the sum of the squares of the legs, that is, c2 = a2 + b2, as shown in the animation.

How can this be proved? By creating three more identical triangles and rotating them 90°, 180°, 270° clockwise, respectively, we form a square with sides of length (a+b).







  The area of this newly formed square is equal to the sum of the areas of the four right triangles and the square in the center. Expressing this algebraically, we have:

 

(a+b)2 = 4 [(One half)ab] + c2

By simplifying this equation, we obtain:

 

a2 + b2 = c2