The proof of the Pythagorean Theorem can be explained using the image of a square filled with triangles. The image shows a larger square with a side length of "a" and four smaller squares with side lengths of "b." These smaller squares are positioned at each corner of the larger square. The triangles formed inside the larger square are all right triangles. By rearranging the triangles, we can see that the two smaller squares together cover the same area as the largest square. This can be expressed as: a^2 = b^2 + b^2, which is the Pythagorean Theorem.
