In exercises 1-5, use the diagram. Tell whether the angles are vertical angles, a linear pair, or neither.
1. 1 and 3
2. 2 and 3
3. 4 and 5
4. 5 and 8
5. 4 and 9

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.