David P. Robbins, a noted mathematician who tried in his dying months to solve a problem that had bothered him since he was a boy -- What is the area of a polygon if you know only the lengths of the ...
It may be useful to refer to M1 properties of angles; M1 properties of 2D shapes and M5 Polygons if necessary. The sum of the angles inside any polygon can be found by spitting the polygon into ...
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