Proof: If Equilateral Then Rhombus

Let's prove the following theorem:

if distance WX = distance XY and distance XY = distance YZ and distance YZ = distance ZW, then WXYZ is a rhombus

Z W X Y

Proof:

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Given
1 distance WX = distance XY
2 distance XY = distance YZ
3 distance YZ = distance ZW
Proof Table
# Claim Reason
1 distance WX = distance YZ if distance WX = distance XY and distance XY = distance YZ, then distance WX = distance YZ
2 distance XY = distance ZW if distance XY = distance YZ and distance YZ = distance ZW, then distance XY = distance ZW
3 WXYZ is a parallelogram if distance WX = distance YZ and distance XY = distance ZW, then WXYZ is a parallelogram
4 WXYZ is a rhombus if WXYZ is a parallelogram and distance WX = distance XY, then WXYZ is a rhombus
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