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In Greek mathematics, the explicit proof of Pythagorean theorem can be found in Euclid's Elements of Geometry. As shown in figure 2, because, therefore, rectangles and squares are equal products, and similarly, rectangles and squares are equal products. It should be pointed out that among all the proofs of Pythagoras theorem, Euclid's proof is the most famous, and the Greeks call it the "married woman theorem". The French call it the "donkey bridge problem"; Arabs call it "the portrait of the bride" and "the chair of the bride"; In Europe, some people call it "peacock tail" or "windmill".