Proof: Alternate Interior Angles Theorem (Converse) 4

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	m∠WST = m∠STZ	if WS || TZ, then m∠WST = m∠STZ (Alternate Interior Angles Theorem (Converse) 2)
2	m∠TSW = m∠WST	m∠TSW = m∠WST (Angle Symmetry Property)
3	m∠TSW = m∠STZ	if m∠TSW = m∠WST and m∠WST = m∠STZ, then m∠TSW = m∠STZ (Transitive Property of Equality)

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