Sure. How about the "bases" of a trapezoid ? It just can't be a regular polygon,
which you already knew as soon as you said "they are different lengths".
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A trapezoid has only a pair of parallel sides of different lengths
Two sides are parallel but of different lengths
The parallel sides of a trapezoid are of different lengths.
A trapezoid has only one pair of parallel sides. These parallel sides are opposite and are of different lengths.
A trapezoid has 1 pair of opposite parallel sides of different lengths