Proof: If Parallelogram Then Sides Congruent B

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	△ZWY ≅ △XYW	if WXYZ is a parallelogram, then △ZWY ≅ △XYW (If Parallelogram Diagonal Then Congruent Triangles)
2	distance YZ = distance WX	if △ZWY ≅ △XYW, then distance YZ = distance WX (Congruent Triangles Property 9)
3	distance WX = distance YZ	if distance YZ = distance WX, then distance WX = distance YZ (Symmetric Property of Equality)

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