Adjacent sides are perpendicular. Opposite sides are parallel.
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A rectangle always has perpendicular sides.
"rectangle"
I think rectangles do not have perpendicular sides. there are some perpendicular sides in a rectangle stupid person
It has 4 perpendicular sides creating 4 interior right angles that add up to 360 degrees
Square & Rectangle are the only two. Rhombus (diamond) & parallelogram have adjacent sides, but no 90 degree angles (not perpendicular).