What is the reason for 9 Given ABCA where E is the midpoint of AC and D is the midpoint of BA Prove DE BC and that BC DE Statement 1 D is the midpoint of AB E is the midpoint of AC 2 MAD mDB MAE mEB 3 mzA mZA 4 AD DB AB AE EC AC 5 AD AD AB AE AE AC B 6 2 AD AB 2 AE AC Reason 1 2 3 4 C 5 6 Simplify