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Ptolemy's Theorem
Let ABCD be a quadrilateral where all the vertices lie on a circle. As long as the (green) diagonals cross, ; in words, the sum of the products of the two pairs of opposite sides equals the product of the diagonals.
Drag any vertex to another location on the circle.




"Ptolemy's Theorem" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/PtolemysTheorem/
Contributed by: Jay Warendorff
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