This is a parallelogram if it has 4 sides
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Yes:As the shape is regular all sides are equal in length (and congruent).An octagon has 8 sides. As this is an even number of sides, the opposite sides are parallel.
rhombus
A square's opposite sides are parallel and all the sides are congruent.
Yes opposite sides are parallel and congruent
Any shape with at least two straight sides can have opposite parallel and congruent sides. For example, a running track.