Proof: Parts of Line 3

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	distance CA = (distance CB) + (distance BA)	if m∠CBA = 180, then distance CA = (distance CB) + (distance BA) (Collinear Points Property)
3	(distance CA) + ((distance CB) ⋅ (-1)) = distance BA	if distance CA = (distance CB) + (distance BA), then (distance CA) + ((distance CB) ⋅ (-1)) = distance BA (Subtract Both Sides 2)

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