Given: δabc with prove: statement reason 1. given 2. addition property of equality 3. using common denominators 4. ab = ad + db cb = ce + eb segment addition 5. substitution property of equality 6. ∠abc ≅ ∠dbe reflexive property of congruence 7. δabc ~ δdbe sas similarity criterion 8. corresponding angles of similar triangles are congruent. 9. if the corresponding angles formed by two lines cut by a transversal are congruent, then the lines are parallel. question 19 of 44 what is the missing step in this proof? ∠bac ≅ ∠acb ∠bde ≅ ∠deb ∠ade ≅ ∠dec ∠bac ≅ ∠bde ∠abc ≅ ∠dbe nextreset