Philippa M. Rhodes, 1998

This essay will explore the relationships between triangles and the polygons or points formed by the intersection of rays that bisect and trisect the angles of the triangle.

First, bisect each angle of a given triangle. Notice that the three bisectors
intersect at the same point. **(concurrent)**

Using GSP, investigations can be done in order to make conjectures.

**Simson Line**

The orientation of the **deltoid** formed by the envolope of the Simson
line is the same as the external Morley's triangle

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