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This image was selected as picture of the month on the Mathematics Portal for October 2011 |
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This image appeared on Wikipedia's Main Page in the Did you know? column on 26 April 2013. |
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Summary
Description |
English: Animation of a proof of Pythagoras' theorem, showing how by rearranging triangles the areas a2 + b2 and c2 can be shown to be the same. The area of the outer square never changes, and the total area of the four right triangles is the same at both the beginning and the end, therefore the black area at the beginning, a2 + b2, must equal the black area at the end, c2. The angle of the triangles is arbitrary, therefore this works as a general proof. To be more explicit...
The situation at the start is:
Area_of_the_Outer_Square - (4 x Area_of_a_Triangle) = a2 + b2
...and the situation at the end is:
Area_of_the_Outer_Square - (4 x Area_of_a_Triangle) = c2
The values on both left-hand sides of these two equations are exactly the same (only positions have changed) therefore the values on the right-hand sides must also be exactly the same: a 2 + b 2 = c 2.
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Source |
Own work |
Author |
JohnBlackburne |
Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
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