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Geometry Problem 997. Equilateral Triangle, Vertices, Three Parallel Lines, Distance, Metric Relations. Level: School, College.

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Lines L1, L2, and L3 are parallel (infographic below) and line DBE is perpendicular to L1. If BD = 6 and BE = 9, find the side of equilateral triangle ABC.
 

Geometry Problem 997: Equilateral Triangle, Vertices, Three Parallel Lines, Distance, Metric Relations

 

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