If m 2 m 3 and m 3 m 1 then m 2 m 1 If AC AB BC then AB
     If m  2 = m  3 and m  3 = m  1, then m  2 = m  1.  If AC = AB + BC, then AB + BC = AC.  m  ABC = m  ABC  Items 30-37; In the diagram below AC = BD. Fill in the reasons to show CD = AB  Given: AC = BD  Prove: CD = AB  AC = BD  AC = AB + BC  AB + BC = BD  BD = BC + CD  AB + BC = BC + CD  AB = CD  CD = AB  CD = AB  Indicate whether the statement is true or false by circling the appropriate letter.  T F A theorem is a statement that can be proven using definitions, properties, postulates, and previously proven theorems.  T F Unlike a theorem, a postulate is a rate that is accepted without proof. 
  
  Solution
28;- Segment addition postulate
36:- Subtraction property of equality
37:- Definition of congruent segments
38:- T
39:- T

