Proof: Midpoint Then 180

Let's prove the following theorem:

if M is the midpoint of line AB, then (m∠AMX) + (m∠XMB) = 180

Proof:

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Given
1 M is the midpoint of line AB
Proof Table
# Claim Reason
1 m∠AMB = 180 if M is the midpoint of line AB, then m∠AMB = 180
2 m∠AMB = (m∠AMX) + (m∠XMB) if m∠AMB = 180, then m∠AMB = (m∠AMX) + (m∠XMB)
3 (m∠AMX) + (m∠XMB) = 180 if m∠AMB = (m∠AMX) + (m∠XMB) and m∠AMB = 180, then (m∠AMX) + (m∠XMB) = 180

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