Proof: Exterior Angle Equal to Sum of Nonadjacent 2

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	m∠WYZ = (m∠WXY) + (m∠YWX)	if m∠XYZ = 180, then m∠WYZ = (m∠WXY) + (m∠YWX) (Exterior Angle Equal to Sum of Nonadjacent)
2	m∠YWX = m∠XWY	m∠YWX = m∠XWY (Angle Symmetry Property)
3	(m∠WXY) + (m∠XWY) = m∠WYZ	if m∠WYZ = (m∠WXY) + (m∠YWX) and m∠YWX = m∠XWY, then (m∠WXY) + (m∠XWY) = m∠WYZ (Reorder Terms 5)

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