Ptolemy's Theorem GMM 2f
- Author:
- heinos
Ptolemy's theorem states that when a quadrilateral is inscribed in a circle and the diagonals of that quadrilateral are drawn, the product of the diagonals is equal to the product of two opposite sides of the quadrilateral plus the product of the other two sides. This means that CE*DF=(CF*DE)+(FE*CD).