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A 3-sided polygon has 0 parallel sides.

A 4-sided polygon can have 0, 2 or 4 parallel sides.

A 5-sided polygon can have 0, 2, 3 or 4 parallel sides.

In general, an n-sided polygon can have 0, 2, 3, ..., n-1, or n parallel sides where n>5.

A polygon with n sides can have n pairs of parallel sides (if n is even) or (n-1)/2 pairs if n is odd AND greater than 3. But it need not have any.

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Where are the parallel sides of a polygon?

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