Proof: Tangent 2

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	∠CBA is a right angle	if ∠ABC is a right angle, then ∠CBA is a right angle (Right Angle Reverse)
2	tangent of (m∠BAC) = (distance CB) / (distance BA)	if ∠CBA is a right angle, then tangent of (m∠BAC) = (distance CB) / (distance BA) (Definition of Tangent)

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