Given a triangle ABC with side AB greater than BC, let M be the midpoint of AC and L be the point at which the bisector of angle ∠B intersects side AC. The line parallel to AB, which intersects the bisector BL at D, is drawn by M, and the line parallel to the side BC that intersects the median BM at E is drawn by L. Show that ED is perpendicular to BL. geometryangle bisectormedianparallelperpendicular