perpendicular.
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Shapes are not parallel or perpendicular. Lines are.Every side of a rectangle is parallel to the side opposite it,and perpendicular to both of the sides next to it.
Perpendicular lines intesect each other at 90 degrees and are not normally parallel to each other unless as in a square or rectangle.
There are four perpendicular lines in a rectangle
Aquadrilateral that is called a rectangle has by definition 4 right angles (all sides are perpendicular to their neighbors) and opposite sides that are equal in length and parallel.
PERPENDICULAR