In an isosceles triangle ABC (AB = BC), N is the midpoint of the median BM and MD is perpendicular to CN (see the figure below). Prove that the angles BAD and ACN are equal.
See also: Geometry problem 1271 in motion.
Geometry Problems 1271-1280 Visual Index Open Problems All Problems Triangles Isosceles Triangle Median Index Midpoint Perpendicular lines Altitude Congruence View or Post a solution