The Malfatti triangle 
of a reference triangle 
is the triangle formed by the centers of its Malfatti
circles.
Malfatti Triangle
See also
Malfatti Circles, Malfatti's ProblemExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Malfatti Triangle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/MalfattiTriangle.html