Proof: Collinear Points

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	m∠DBX = m∠DBA	if m∠AXB = 180, then m∠DBX = m∠DBA (Collinear Angles Property 10)
2	m∠CAY = m∠CAB	if m∠AYB = 180, then m∠CAY = m∠CAB (Collinear Angles Property 3 C)
3	m∠DBA = m∠CAB	if m∠DBX = m∠CAY and m∠DBX = m∠DBA and m∠CAY = m∠CAB, then m∠DBA = m∠CAB (Transitive Property Application 2)

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