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Published online by Cambridge University Press: 20 January 2009
The greatest line joining two points in the perimeter of a polygon is a side or a diagonal of the polygon.
For (fig. 2) PS is obviously less than one or other of the lines PQ, PR. Hence if AB, CD (fig. 3) are any two finite lines, L and M any points, one in each of these lines, LM is less than LC, or LD and LC is less than CA or CB. From this the theorem follows at once. The theorem and the above proof apply to crossed and gauche polygons.
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