Proof: Alternate Interior Angles Theorem (Converse) 3

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∠STZ = m∠ZTS	m∠STZ = m∠ZTS (Angle Symmetry Property)
3	m∠WST = m∠ZTS	if m∠WST = m∠STZ and m∠STZ = m∠ZTS, then m∠WST = m∠ZTS (Transitive Property of Equality)

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