If the tangents at and to the circumcircle of a triangle intersect in a point , then the circle with center and which passes through and is called the excosine circle, and cuts and in two points which are extremities of a diameter.

# Excosine Circle

## See also

Cosine Circle## Explore with Wolfram|Alpha

## References

Lachlan, R.*An Elementary Treatise on Modern Pure Geometry.*London: Macmillian, p. 75, 1893.

## Referenced on Wolfram|Alpha

Excosine Circle## Cite this as:

Weisstein, Eric W. "Excosine Circle."
From *MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/ExcosineCircle.html