To determine the number of pairs of perpendicular sides a shape has, we need to understand what perpendicular sides are. Perpendicular sides are sides that intersect at right angles, forming a 90-degree angle.
In order to count the number of pairs of perpendicular sides, we need to examine the shape. If a shape has four sides, like a rectangle or a square, it will have two pairs of perpendicular sides. This is because opposite sides of these shapes are parallel, and adjacent sides are perpendicular to each other.
If the shape has more than four sides, such as a pentagon or a hexagon, it may or may not have pairs of perpendicular sides. It depends on the specific angles and orientations of the sides.
Therefore, the number of pairs of perpendicular sides in a shape can vary depending on the shape itself. If you have a specific shape in mind, please provide more information so that I can give a more accurate answer.