Proof: Collinear Points
Let's prove the following theorem:
if m∠DBX = m∠CAY and m∠AXB = 180 and m∠AYB = 180, then m∠DBA = m∠CAB
Proof:
Proof Table
| # | Claim | Reason |
|---|---|---|
| 1 | m∠DBX = m∠DBA | if m∠AXB = 180, then m∠DBX = m∠DBA |
| 2 | m∠CAY = m∠CAB | if m∠AYB = 180, then m∠CAY = m∠CAB |
| 3 | m∠DBA = m∠CAB | if m∠DBX = m∠CAY and m∠DBX = m∠DBA and m∠CAY = m∠CAB, then m∠DBA = m∠CAB |
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