Proof: Parallel Then Corresponding Short 3b

Let's prove the following theorem:

if WX || YZ and m∠ZXR = 180, then m∠YZR = m∠WXR

R W X Y Z

Proof:

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Given
1 WX || YZ
2 m∠ZXR = 180
Proof Table
# Claim Reason
1 m∠YZX = m∠WXR if WX || YZ and m∠ZXR = 180, then m∠YZX = m∠WXR
2 m∠YZX = m∠YZR if m∠ZXR = 180, then m∠YZX = m∠YZR
3 m∠YZR = m∠WXR if m∠YZX = m∠YZR and m∠YZX = m∠WXR, then m∠YZR = m∠WXR

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