Proof: Angle Swap

Let's prove the following theorem:

if m∠DXY = 90 and m∠DXY = m∠DXB, then m∠BXD = 90

D X Y B

Proof:

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Given
1 m∠DXY = 90
2 m∠DXY = m∠DXB
Proof Table
# Claim Reason
1 m∠DXB = 90 if m∠DXY = m∠DXB and m∠DXY = 90, then m∠DXB = 90
2 m∠BXD = 90 if m∠DXB = 90, then m∠BXD = 90

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