Proof: Collinear Angles Property 3 B

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	m∠CBA = 180	if m∠ABC = 180, then m∠CBA = 180 (Angle Symmetry Example 2)
2	m∠XAC = m∠XAB	if m∠CBA = 180, then m∠XAC = m∠XAB (Collinear Angles Property 3)

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