Question

What is the missing step in this proof?

Statement: ∠4≅∠5, and ∠1≅∠3.
Reason: Alternate Interior Angles Theorem

Statement: DE←→ is parallel to AC⎯⎯⎯⎯⎯.
Reason: AB⎯⎯⎯⎯⎯ is a transversal cutting DE←→ and AC⎯⎯⎯⎯⎯.

Statement: ∠1≅∠4, and ∠3≅∠5.
Reason: Alternate Interior Angles Theorem

Statement: ∠1≅∠4, and ∠3≅∠5.
Reason: ∠1 and ∠4 , and ∠3 and ∠5 are pairs of supplementary angles.