Online Geometry Problems

Online Geometry Problem 779: Triangle, Altitude, Orthocenter, Vertex, Midpoint, Side, Angle, 90 Degrees. Level: High School, College, Mathematics Education

The figure below shows a triangle ABC with the altitude CD and the orthocenter H. If F and M are the midpoints of AC and BH, respectively, prove that the measure of the angle FDM is 90 degrees.

Triangle, Altitude, Orthocenter, Midpoint, Angle, 90 Degrees


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