B 16. Given: AB = AC M is the midpoint of BC Prove: LB = LC . M A 'C Statement Reason Fill in the missing parts for questions 17. 17. Given: WZ || XY Prove: m/2 + m/4 + m45 = 180 Statements Reasons 1) WE'll XY 1) Given W Z 2) mz1 + = 180 2) 3 3) mLZWX = m/2 + m/3 3) 5 4) 4) Substitution 5) 5) Alt. Int. Angles Thm 6) 6) Def. of 7) m/2 + m24+ m25 =180 7)