To prove that quadrilateral ABCD is a parallelogram, we can rely on specific properties of parallelograms. One valid way to prove this is by demonstrating that opposite sides are congruent.
If you establish that:
- Opposite sides of the figure are congruent (i.e., \(AB \cong CD\) and \(AD \cong BC\))
Then you can conclude that quadrilateral ABCD is a parallelogram based on the property that states if both pairs of opposite sides of a quadrilateral are congruent, the quadrilateral is a parallelogram.
Therefore, the correct response is:
Opposite sides of the figure are congruent.
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