Proof: Exterior Angle Other C
Let's prove the following theorem:
if m∠XEY = 180, then m∠ZEY > m∠YXZ
Proof:
Given
1 | m∠XEY = 180 |
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# | 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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