Proof: Alternate Interior Angles Theorem (Converse) 2

Let's prove the following theorem:

Proof:

Proof Table

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

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