Proofs day 1

1. The document provides instructions for completing geometry drill problems, including writing a two-column proof given that AB=CD and proving that AC=BD. 2. It gives the steps of the proof: 1) AB=CD is given, 2) BC=BC by the reflexive property of equality, 3) AB+BC=CD+BC by the addition property of equality, 4) AB+BC=AC and CD+BC=BD by segment addition, and 5) AC=BD by substitution. 3. It also provides an example of a diagram for a proof to be completed.