A Polygon which has both a Circumcircle (which touches each vertex) and an Incircle (which is tangent
to each side). All Triangles are bicentric with

(1) |

(2) |

(3) | |||

(4) |

(Beyer 1987). In addition,

(5) |

(6) |

(7) |

**References**

Beyer, W. H. (Ed.) *CRC Standard Mathematical Tables, 28th ed.* Boca Raton, FL: CRC Press, p. 124, 1987.

Dörrie, H. ``Fuss' Problem of the Chord-Tangent Quadrilateral.'' §39 in
*100 Great Problems of Elementary Mathematics: Their History and Solutions.* New York: Dover, pp. 188-193, 1965.

© 1996-9

1999-05-26