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Τρίτη 14 Μαΐου 2024

Newton's and Léon Anne's Theorems

Newton Theorem
The center of the circle inscribed into a quadrilateral lies on the line joining the midpoints of the latter's diagonals.
Léon Anne Theorem
In any quadrilateral ABCD that is not a parallelogram, the locus of points O such that
[AOB]+[COD]=[BOC]+[AOD]
is Newton's line of the quadrilateral.