Art of Problem Solving

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Revision as of 15:39, 26 November 2018

Problem of the Week

2001 AMC 8, Problem 23

Points $R$, $S$ and $T$ are vertices of an equilateral triangle, and points $X$, $Y$ and $Z$ are midpoints of its sides. How many noncongruent triangles can be drawn using any three of these six points as vertices?