The line through a triangle polygon vertex obtained by reflecting an initial line (also through a polygon vertex) about the angle bisector. If three lines from the polygon vertices of a triangle are concurrent at , then their isogonal lines are also concurrent, and the point of concurrence is called the isogonal conjugate point.

# Isogonal Line

## See also

Isogonal Conjugate## Explore with Wolfram|Alpha

## References

Johnson, R. A.*Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle.*Boston, MA: Houghton Mifflin, pp. 153-157, 1929.

## Referenced on Wolfram|Alpha

Isogonal Line## Cite this as:

Weisstein, Eric W. "Isogonal Line." From
*MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/IsogonalLine.html