1. Formal Geometry 2.6-8 Review Evens

2. 2) 1. AB = AB 4) 1. ABC ≅ DEF 2. DEF ≅ ABC reflexive symmetric 8) 1. AB + BC = ED + BC 2. AB = ED 6) 1. 3x = 27 2. x = 9 subtraction division

3. 10) m3 = x + 40, m4 = x + 10 m5 = 3x + 30 3 4 5 m3 + m4 = 90 x + 40 + x + 10 = 90 2x + 50 = 90 2x = 40 x = 20 m3 = 20 + 40 = 60° m4 = 20 + 10 = 30° m5 = 90°

4. 12) m9 = 6x + 4, m10 = 4x + 14 6x + 4 11 9 m9 = m10 6x + 4 = 4x + 14 2x + 4 = 14 2x = 10 x = 5 m9 = 6(5) + 4 = 34° m10 = 34° m11 = 180 – 34 = 146° 10 4x + 14

5. 14) Given: 2(x +5) = 8(x – 7) Prove: x = 11

6. 16) Given: N is midpoint of MP P is midpoint of NQ Prove: M N P Q

7. B D 15x 18) Given: CEB and DEB are a linear pair. Prove: x = 5 20x + 5 E C A

8. 20) Given: bisects OIG bisects CIR Prove: CIORIG O C R I G