2007 AMC 10B, #21/ Hard -5.38% of answering students correctly answered the question
Classifications
NCTM Standard: Geometry -- Explore relationships (including congruence and similarity) among classes of two- and three-dimensional geometric objects, make and test conjectures about them, and solve problems involving them. Mathworld.com Classification: Geometry > Plane Geometry > Triangles > Special Triangles > Other Triangles > Similar Triangles
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