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When did you learn the equal area method?
The first volume of eighth grade mathematics

According to the data, there are more than 1000 algorithms for the equal area method of Pythagorean theorem in the first volume of eighth grade mathematics. Now, a common algorithm is to put four congruent right-angled triangles into a square with the hypotenuse as the side length. There is a small square in the square, and its side length is exactly the longer right-angled side of the right-angled triangle minus the shorter right-angled side. Then pythagorean theorem can be deduced by using equal area method and exhausted square formula. Let A and B be right-angled sides and C be hypotenuse, then the square of C is the area of a big square, 2ab is the area of four right-angled triangles, and the square of the difference between B and A is the area of a small square.