Proof: Collinear Points Theorem

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	m∠ABC = (m∠ABX) + (m∠XBC)	if m∠ABC = 180, then m∠ABC = (m∠ABX) + (m∠XBC) (Collinear Points Property 2)
2	(m∠ABX) + (m∠XBC) = 180	if m∠ABC = (m∠ABX) + (m∠XBC) and m∠ABC = 180, then (m∠ABX) + (m∠XBC) = 180 (Transitive Property of Equality Variation 2)

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