Proof: Parallel Then Aia 2
Let's prove the following theorem:
if WX || YZ and m∠WSX = 180 and m∠YTZ = 180, then m∠XST = m∠STY
Proof:
Proof Table
| # | Claim | Reason |
|---|---|---|
| 1 | XW || ZY | if WX || YZ, then XW || ZY |
| 2 | m∠XSW = 180 | if m∠WSX = 180, then m∠XSW = 180 |
| 3 | m∠ZTY = 180 | if m∠YTZ = 180, then m∠ZTY = 180 |
| 4 | m∠XST = m∠STY | if XW || ZY and m∠XSW = 180 and m∠ZTY = 180, then m∠XST = m∠STY |
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