[Test.3] Euclid's elegant proof of the Pythagorean theorem depends upon the diagram of Figure below, sometimes referred to as the Fanciscan's cowl of as the bride's chair.   A precis of the proof runs as ? (AC)² = 2¡âJAB = 2¡âCAD = ADKL. Similarly, (BC)² and so on. Fill in the detail of this proof.