Encyclopedia
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Convex Polygon: Encyclopedia Ii - Convex Polygon - Concave Polygons
If a simple polygon is not convex, it is called concave. At least one internal angle of a concave polygon is larger than 180 degrees.
A c...
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Encyclopedia
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George Szekeres: Encyclopedia Ii - George Szekeres - The Happy Ending Problem
The so-called Happy Ending problem is an example of how mathematics pervaded George's life. During 1933, George and several other student...
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