We are all familiar with Pythagorean theorem and people had proved it a lot. "A picture is worth a thousand text." The animation shown above let us visualize the plain math. The beauty of mathematics is on simplicity itself ,not on the difficulty it shouldn't be. Since a picture can demonstrate the fact ,why bother to explain in words?
[圖片來源]: https://lh5.googleusercontent.com/-BkRKn_Bot9U/UM0hsNQv5QI/AAAAAAAAF-Y/5xKjmuCMA2w/w497-h373/W8VJp.jpg
[最先刊登]: https://plus.google.com/u/0/113026104107031516488/posts/CbcgaRoaFM5

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