Geometric Proof of the Pythagorean Theorem (Euclid's Elements)

This applet demonstrates the classic geometric proof of the Pythagorean theorem from Euclid's Elements. By constructing a right triangle and squares on its sides, it uses polygon area decomposition and congruent triangles to visually show that the sum of the areas of the squares on the legs equals the area of the square on the hypotenuse. Ideal for geometry education.