I suppose. All of a square's sides are perpendicular.
Any shape, other than a triangle can have a pair of perpendicular sides.
A square and a rectangle because their corners meet at 90 degrees
The question contradicts itself. A dodecagon need not have any perpendicular sides.
The sides perpendicular to each other are at right angles (90 degrees, or square) to each other. An example of a figure with two pair of perpendicular sides is the rectangle.
shape no pairs of perpendicular sides
It could be a right angle triangle