Proof: Angle 90 Then Perpendicular

Let's prove the following theorem:

if m∠ABC = 90, then AB ⊥ BC

Proof:

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Given
1 m∠ABC = 90
Proof Table
# Claim Reason
1 ∠ABC is a right angle if m∠ABC = 90, then ∠ABC is a right angle
2 AB ⊥ BC if ∠ABC is a right angle, then AB ⊥ BC

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