The Japanese theorem for cyclic quadrilaterals is a result in geometry stating that the centers of the incircles of certain triangles formed inside a cyclic quadrilateral are the vertices of a rectangle. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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1. Japanese theorem for cyclic quadrilaterals (Wikipedia)
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