Proof: Exterior Angle Other C

Let's prove the following theorem:

if m∠XEY = 180, then m∠ZEY > m∠YXZ

E Y X Z

Proof:

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Given
1 m∠XEY = 180
Proof Table
# Claim Reason
1 m∠ZEY > m∠ZXE if m∠XEY = 180, then m∠ZEY > m∠ZXE
2 m∠ZXE = m∠YXZ if m∠XEY = 180, then m∠ZXE = m∠YXZ
3 m∠ZEY > m∠YXZ if m∠ZEY > m∠ZXE and m∠ZXE = m∠YXZ, then m∠ZEY > m∠YXZ

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