Proof: Supplementary Then 180

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	(m∠ABC) + (m∠DEF) = 180	if ∠ABC and ∠DEF are supplementary, then (m∠ABC) + (m∠DEF) = 180 (Supplementary Angles Property)
2	m∠DEF = m∠FED	m∠DEF = m∠FED (Angle Symmetry Property)
3	(m∠ABC) + (m∠FED) = 180	if (m∠ABC) + (m∠DEF) = 180 and m∠DEF = m∠FED, then (m∠ABC) + (m∠FED) = 180 (Substitution Example 10)

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