engleski

Some interesring properties of heptagonal triangle

The triangle with the angles $\frac{;\pi};{;7};, \frac{;2 \pi};{;7};, \frac{;4 \pi};{;7};$ is called a heptagonal triangle (according to Bankoff and Garfunkel). This triangle has many interesting properties and some of them will be presented in this talk. The relationship of the heptagonal triangle with its successive orthic triangles will be considered. The meaning of the heptagonal triangle, in the known Dixmier--Kahane--Nicholas inequality, will also be investigated.

heptagonal triangle; Dixmier--Kahane--Nicholas inequality

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