Proof: Angle Symmetry Example 2

Let's prove the following theorem:

if m∠ABC = x, then m∠CBA = x

A B C x

Proof:

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Given
1 m∠ABC = x
Proof Table
# Claim Reason
1 m∠ABC = m∠CBA m∠ABC = m∠CBA
2 m∠CBA = x if m∠ABC = m∠CBA and m∠ABC = x, then m∠CBA = x

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