# Families of Four-Point Touching Isosceles Triangles

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This Demonstration shows four-point touching families of of isosceles triangles. The task is to find parameters so that the triangles form a four-point touching family.

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Contributed by: Izidor Hafner (May 2019)

Open content licensed under CC BY-NC-SA

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A family is said to be -touching provided each element of has a nonempty intersection with precisely other elements of . A -touching family is said to be point--touching if any two touching sets have only a single common point [1].

[1] B. Grünbaum, "Families of Point-Touching Squares," *Geombinatorics*, 12(4), 2003 pp. 167–174. (Mar 27, 2019) sites.math.washington.edu/~grunbaum/Familiesofpointtouchin.pdf.

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