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Adjacent sides are perpendicular. Opposite sides are parallel.
Square & Rectangle are the only two. Rhombus (diamond) & parallelogram have adjacent sides, but no 90 degree angles (not perpendicular).
It is a quadrilateral shape because it has 4 sides and it has 2 pairs of adjacent sides that are equal with 1 pair of opposite angles being equal and its diagonale are perpendicular.
A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
In a square adjacent sides are perpendicular to each other and opposite sides are parallel to each other.