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Online Geometry Problem 606: Isosceles Triangles, Perpendicular and Parallel Lines. Level: Mathematics Education, High School, College

The figure shows the isosceles triangles ABC and DBE. If FG, FH, FM, and FN are perpendicular to AB, BC, BD, and BE, respectively, prove that lines GH and MN are parallel.

Isosceles triangle, perpendicular, parallel


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