A regular polygon with an even number of sides.
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a rhombusNotice that if all 4 sides are equal, then they must be parallel.
Any polygon with four or more sides can have a pair of parallel sides. It is also possible to to have non-polygonal shapes - eg a cigar-shape - that has parallel sides.
It can have anywhere between 0 and 12 pairs of parallel sides.
any rhombus
A triangle as no other 2d shape can have 3 sides.