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Geometry Problem 956: Two Equilateral Triangles, Center, Collinear
Points, Midpoint, Right Triangle, 30, 60, 90 Degrees. Level: School, College, Mathematics
Education
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The figure shows an equilateral
triangle ABC and equilateral triangle BDE of center O such that
A, B, and D are collinear. If F is the midpoint of AE, prove
that the triangle CFO is a 30-90-60 degrees triangle.
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