Proof: Collinear Then Equal 2 Lines
Let's prove the following theorem:
if m∠ADC = 180 and m∠BEC = 180, then m∠ACB = m∠DCE
Proof:
Proof Table
# | Claim | Reason |
---|---|---|
1 | m∠ACB = m∠DCB | if m∠ADC = 180, then m∠ACB = m∠DCB |
2 | m∠DCB = m∠DCE | if m∠BEC = 180, then m∠DCB = m∠DCE |
3 | m∠ACB = m∠DCE | if m∠ACB = m∠DCB and m∠DCB = m∠DCE, then m∠ACB = m∠DCE |
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