Proof: Tangent 3

Let's prove the following theorem:

if ∠ABC is a right angle, then tangent of (m∠BAC) = (distance BC) / (distance AB)

Proof:

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Given
1 ∠ABC is a right angle
Proof Table
# Claim Reason
1 tangent of (m∠BAC) = (distance CB) / (distance BA) if ∠ABC is a right angle, then tangent of (m∠BAC) = (distance CB) / (distance BA)
2 tangent of (m∠BAC) = (distance BC) / (distance AB) if tangent of (m∠BAC) = (distance CB) / (distance BA), then tangent of (m∠BAC) = (distance BC) / (distance AB)

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