A perpendicular side is a right angle.A right angle is a perfectly L on any corner.The shape has to have no straight lines that meet.An example would be a triangle.
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shape no pairs of perpendicular sides
A right angled triangle is an example of a shape with exactly 2 perpendicular sides.
a Kite
The question asks about four sides and 2 perpendicular sides. That makes 6 sides in all. So it is a hexagon with either only one right angle, or two sides that are mutually perpendicular.
a quadrilateral is a shape with four equal sides.