Difference between revisions of "2009 AMC 8 Problems/Problem 20"
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How many non-congruent triangles have vertices at three of the eight points in the array shown below? | How many non-congruent triangles have vertices at three of the eight points in the array shown below? | ||
Revision as of 13:28, 14 August 2011
Problem
How many non-congruent triangles have vertices at three of the eight points in the array shown below?
![[asy]dot((0,0)); dot((0,.5)); dot((.5,0)); dot((.5,.5)); dot((1,0)); dot((1,.5)); dot((1.5,0)); dot((1.5,.5));[/asy]](http://latex.artofproblemsolving.com/f/0/c/f0cff29537e2aff0fa79e3cca763dcb4be379f9c.png)
