Proof: Equal Angles
Let's prove the following theorem:
if m∠AXC = 180 and m∠DCA = m∠CAB, then m∠DCX = m∠XAB
Proof:
Proof Table
| # | Claim | Reason |
|---|---|---|
| 1 | m∠DCA = m∠DCX | if m∠AXC = 180, then m∠DCA = m∠DCX |
| 2 | m∠DCX = m∠CAB | if m∠DCA = m∠DCX and m∠DCA = m∠CAB, then m∠DCX = m∠CAB |
| 3 | m∠CAB = m∠XAB | if m∠AXC = 180, then m∠CAB = m∠XAB |
| 4 | m∠DCX = m∠XAB | if m∠DCX = m∠CAB and m∠CAB = m∠XAB, then m∠DCX = m∠XAB |
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