Yes. Squares only contain 90 degree angles, so all sides are perpendicular to the adjacent sides and parallel to the opposite one.
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In a rectangle, consecutive sides are the pairs of sides that share a common vertex or corner. For example, the top and right sides, or the bottom and left sides of a rectangle are consecutive sides. These sides are perpendicular to each other, forming right angles at their intersection points.
I suppose. All of a square's sides are perpendicular.
Square
A rhombus has no perpendicular sides but its diagonals are perpendicular to each other and meet at right angles.
A rhombic octagon. An ordinary regular octagon does have perpendicular sides. They do not meet in the outline of the octagon because they are alternate, but they are still perpendicular. However, in the same way that a rhombus is a distorted square, a rhombic octagon can have 4 pairs of parallel sides but no perpendicular ones.