Proof: Collinear Angles B

Let's prove the following theorem:

if m∠ABC = 180, then m∠CAX = m∠BAX

A C B X

Proof:

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

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