 Therefore, triangles "ABE" and "CDE" are congruent (ASA postulate, "two corresponding angles and the included side").Therefore,

Since the diagonals "AC" and "BD" divide each other into segments of equal length, the diagonals bisect each other.Separately, since the diagonals "AC" and "BD" bisect each other at point "E", point "E" is the midpoint of each diagonal.