Internal angle

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In geometry, an internal angle is an angle that two sides of a polygon form by touching each other. The following rectangle has internal angles of 90 degrees. The sum of the internal angles of a polygon can be obtained by the formula Sum=(n-2)180, where n is the number of sides.

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Internal_angle (http://en.wikipedia.org/wiki/Internal_angle) version history (http://en.wikipedia.org/w/index.php?title=Internal_angle&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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