?ABC is an isosceles triangle with legs AB and AC. ?AYX is also an isosceles triangle with legs AY and AX. The proof that ?ABC ~ ?AYX is shown. Statements Reasons 1. ?ABC is isosceles with legs AB and AC; ?AYX is also isosceles with legs AY and AX. 1. Given 2. AB ? AC and AY ? AX 2. Definition of isosceles triangle 3. AB = AC and AY = AX 3. Definition of congruency 4. AY • AC = AX • AC 4. Multiplication property of equality 5. AY • AC = AX • AB 5. Substitution property of equality 6. 6. Division property of equality 7. 7. Division property of equality 8. ? 8. ? 9. ?ABC ~ ?AYX 9. SAS similarity theorem Which statement and reason are missing in the proof? ?A ? ?A; reflexive property ?X ? ?X; reflexive property ?ABC ? ?AYX; corresponding angles of similar triangles ?ABC ? ?AXY; corresponding angles of similar triangles