Two triangles are said to be poristic triangles if they share the same incircle and circumcircle. More specifically, in the plane of a reference triangle, a triangle is said to be poristic if it has the same incircle and circumcircle as the reference triangle.

# Poristic Triangles

## See also

Poncelet's Porism, Porism
*This entry contributed by Floor
van Lamoen*

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## References

Brisse, E. "Perspective Poristic Triangles."*Forum Geom.*

**1**, 9-16, 2001. http://forumgeom.fau.edu/FG2001volume1/FG200103index.html.Gallatly, W. "Poristic Triangles." Ch. 3 in

*The Modern Geometry of the Triangle, 2nd ed.*London: Hodgson, pp. 15-23, 1913.

## Referenced on Wolfram|Alpha

Poristic Triangles## Cite this as:

van Lamoen, Floor. "Poristic Triangles." From *MathWorld*--A Wolfram Web Resource, created by Eric
W. Weisstein. https://mathworld.wolfram.com/PoristicTriangles.html