Squares on the Sides of a Quadrilateral
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The line segments joining the centers of the squares on opposite sides of a quadrilateral are orthogonal and have the same length.
Contributed by: Tomas Garza (January 2020)
Open content licensed under CC BY-NC-SA
The proof of this theorem uses complex numbers .
 T. Needham, Visual Complex Analysis, New York: Oxford University Press, 1997, p. 16.