Proof: Angle to Self
Let's prove the following theorem:
if m∠BDA = 180 and m∠CEA = 180, then m∠BAE = m∠CAD
Proof:
Proof Table
| # | Claim | Reason |
|---|---|---|
| 1 | m∠DAE = m∠BAE | if m∠BDA = 180, then m∠DAE = m∠BAE |
| 2 | m∠EAD = m∠CAD | if m∠CEA = 180, then m∠EAD = m∠CAD |
| 3 | m∠DAE = m∠EAD | m∠DAE = m∠EAD |
| 4 | m∠EAD = m∠BAE | if m∠DAE = m∠EAD and m∠DAE = m∠BAE, then m∠EAD = m∠BAE |
| 5 | m∠BAE = m∠CAD | if m∠EAD = m∠BAE and m∠EAD = m∠CAD, then m∠BAE = m∠CAD |
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