Author Topic: The Pythagorean theorem  (Read 1916 times)

hubag bohol

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The Pythagorean theorem
« on: August 05, 2012, 10:07:22 AM »

In any right triangle, the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares whose sides are the two legs (the two sides that meet at a right angle).



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hubag bohol

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Re: The Pythagorean theorem
« Reply #1 on: August 05, 2012, 10:08:15 AM »
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hubag bohol

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Re: The Pythagorean theorem
« Reply #2 on: August 05, 2012, 10:10:17 AM »
The Pythagorean theorem is named after the Greek mathematician Pythagoras, who by tradition is credited with its discovery and proof, although it is often argued that knowledge of the theorem predates him. There is evidence that Babylonian mathematicians understood the formula, although there is little surviving evidence that they used it in a mathematical framework. --Wiki

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hubag bohol

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Re: The Pythagorean theorem
« Reply #3 on: August 05, 2012, 10:12:30 AM »
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hubag bohol

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Re: The Pythagorean theorem
« Reply #4 on: August 05, 2012, 10:13:24 AM »
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Lorenzo

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Re: The Pythagorean theorem
« Reply #5 on: August 05, 2012, 09:22:26 PM »
In algebraic terms, a² + b² = c² where c is the hypotenuse while a and b are the legs of the triangle.



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hubag bohol

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Re: The Pythagorean theorem
« Reply #6 on: August 05, 2012, 11:05:10 PM »
Perhaps the most famous proof of all times is Euclid's geometric proof (Tropfke 1921ab; Tietze 1965, p. 19), although it is neither the simplest nor the most obvious. Euclid's proof used the figure below, which is sometimes known variously as the bride's chair, peacock tail, or windmill. The philosopher Schopenhauer has described this proof as a "brilliant piece of perversity" (Schopenhauer 1977; Gardner 1984, p. 153).





   

Shearing these triangles gives two more equivalent triangles



Therefore,



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hubag bohol

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Re: The Pythagorean theorem
« Reply #7 on: August 05, 2012, 11:06:32 PM »
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