pythagorean+theorem's+Origin

== (Pythagoras, 572 BC? -497 BC?) The ancient Greek mathematician and philosopher. Both explain the external material world, or the description of the inner spiritual world , can not be no math ! First realize everything has a number of law behind at work, lives in a 2,500 years ago Pythagoras. Pythagoras was born in Samos in the Aegean Sea ( eastern part of this Greek island ), his childhood smart, studious, who studied under the teacher of geometry, natural science and philosophy. Later in that yearning for the wisdom of the East, after a long and arduous journey to Babylon , India and Egypt ( controversial), the absorption of the Arab civilization and Indian civilization ( 480 BC).== = The Origin Of The Pythagorean Theorem = = According to legend, Pythagoras was 500 years BC, when ancient Greek mathematician Pythagoras first discovered. This theorem is also known as " Pythagorean theorem." France and Belgium called it " donkey bridge theorem", Egypt call it " Egyptian triangle ", etc.= = Proof of U.S. president = =（ James A. Garfield ； 1831 - 1881 ） 1881 became the 20th president of the United States.The evidence put forward in 1876. = = Why didthe Presidentthink ofto provethe Pythagorean theoremit?Is heamathematicianor amathenthusiast ? The answeris no.What happenedis this ;= = In 1876aweekendevening, outsidethe U.S. capitalWashington , there is a middle-aged manwaswalkingand enjoy thebeauty ofthe evening , hewas thenthe United StatesOhioRepublicanJiafeide. Hewalked, suddenly foundastonebenchnear , there aretwo childrenareconcentrating ontalking aboutsomething,sometimesloudarguments , sometimeswhispereddiscussion.AscuriosityJiafeiStewartMotherwentto thetwo children , trying to figure outtwokidsin the enddoing.I sawalittle boyisFuzhaobodypaintedwith a branchon the groundaright triangle. SoJiafeiStewartaskedthem todo?I sawthe littleboysaidwithout looking up : "WillPresident, ifthe tworight-angletriangleedges3 and 4, respectively, then the hypotenuselengthhow much? " JiafeiGouldreplied : "Yes 5ah ." little boyand asked: " If tworight anglesides, respectively 5 and7 , then theright-angled trianglethehypotenuselengthis? " JiafeiStewartrepliedwithout hesitation : "Thata certainsquare of the hypotenuseis equal to5plus7squarethe square . " little boy andsaid: " Sir, can you tellthemthe truth? " Jiafei demoment speechless , unable to explainthepsychologicalis not too happy .= = SoJiafeiStewartno longerwalk, go home immediately , devote themselves to studythe problem ofthe little boyleft. After repeatedhisthinking andcalculation, and finally find outthe truth of them , and gives thesimplemethod of proof .=