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## Homework Statement

Given: AB [itex]\coprod[/itex] CD ; [itex]\angle[/itex]A [itex]\cong[/itex] [itex]\angle[/itex]C

Proof: AD [itex]\coprod[/itex] BC

## Homework Equations

Idk how to necessary finish it...

## The Attempt at a Solution

Statement -------------- Proof

1. AB [itex]\coprod[/itex] CD ; [itex]\angle[/itex]A [itex]\cong[/itex] [itex]\angle[/itex]C ----------- 1. Given

2. I say [itex]\angle[/itex]A is supp. [itex]\angle[/itex]D and [itex]\angle[/itex]B is supp. [itex]\angle[/itex]C ----------- 2. If two parallel lines cut by a transversal, then same-side interior angles are supp.

3. AD [itex]\coprod[/itex] BC ---------------- 3. Substitution Prop.