The incenters of four triangles in a cyclic quadrilateral form a rectangle.

Sangaku or San Gaku are Japanese geometrical problems in Euclidean geometry on wooden tablets created during the Edo period (1603-1867) by members of all social classes.

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## Saturday, November 8, 2008

### Sangaku, Japanese, Problem

Labels:
cyclic quadrilateral,
incenter,
sangaku,
triangle

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