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Ptolemy's theorem

Keywords: 
Quadrilateral, Circle, Cyclic, Ptolemy
Type of Math Object: 
Theorem
Major Section: 
Reference
Groups audience: 

Mathematics Subject Classification

51-00 no label found60K25 no label found18-00 no label found68Q70 no label found37B15 no label found18-02 no label found18B20 no label found

Comments

Maybe the word "Ptolemy" could go in the keywords; the search
engine currently finds no hits on that word.
We might mention some of the easy corollaries of Pt's thm. E.g.
if we specialize to the case in which $AC$ and
$BD$ are diameters of the given circle, we get Pythagoras's theorem.
LH

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