Proof: Collinear Angles Property C

Let's prove the following theorem:

if m∠ABC = 180, then m∠ACX = m∠BCX

C A B X

Proof:

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Given
1 m∠ABC = 180
Proof Table
# Claim Reason
1 m∠BCX = m∠ACX if m∠ABC = 180, then m∠BCX = m∠ACX
2 m∠ACX = m∠BCX if m∠BCX = m∠ACX, then m∠ACX = m∠BCX

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