

van Aubel's Theorem: Quadrilateral with Squares, Congruence, 90
Degrees for Tablets, iPad, Nexus, Galaxy. Level: High School, Honors Geometry, College,
Mathematics Education

Given an arbitrary planar quadrilateral UTAH, place a square outwardly on each side,
and connect the centers of opposite squares: M, O, N, and Y. Then van Aubel's theorem states that the two lines
MO and NY are of equal length and cross at a right angle.


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