A single side cannot be perpendicular on its own. Two sides are perpendicular if they intersect at a 90 degree angle. There are many polygons, both regular and irregular, that can have perpendicular sides.
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The diagonals of a square are perpendicular (they intersect and form right angles). But they are angles bisectors since they bisect each pair of opposite angles. A perpendicular bisector actually bisects a side of a figure.
A perpendicular bisector.
the perpendicular distance from the base of a quadrilateral to the opposite side?
How many pairs of perpendicular sides does this figure have?
Any polygon with four or more sides can have perpendicular and parallel lines.