Proof: Distance Property 4

Let's prove the following theorem:

if distance AB = distance CD, then distance DC = distance BA

C D A B

Proof:

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Given
1 distance AB = distance CD
Proof Table
# Claim Reason
1 distance AB = distance BA distance AB = distance BA
2 distance BA = distance CD if distance AB = distance BA and distance AB = distance CD, then distance BA = distance CD
3 distance CD = distance DC distance CD = distance DC
4 distance DC = distance BA if distance BA = distance CD and distance CD = distance DC, then distance DC = distance BA

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