A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is
A heptagonal triangle is a non-isosceles triangle formed by three ver-tices of a regular heptagon. Its angles are π 7 , 2π 7 and 4π 7. As such, there is a unique choice of a companion heptagonal triangle formed by three of the remaining four vertices. Given a heptagonal triangle, we display a number of interesting companion pairs of heptagonal triangles on its nine-point circle and Brocard circle. Among other results on the geometry of the heptagonal triangle, we prove that the circumcenter andfatcat:qe7pzdjlpnbd5isdsbi472nlce