Proof: Alternate Interior Angles Theorem 4

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	WX || YZ	if m∠WSX = 180 and m∠YTZ = 180 and m∠WST = m∠STZ, then WX || YZ (Alternate Interior Angles Theorem)
2	WS || TZ	if WX || YZ and m∠WSX = 180 and m∠YTZ = 180, then WS || TZ (Extended Parallel Lines 3)

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