It has 4 perpendicular lines, or 4 equal sides. However, not all lines are perfectly equal!
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No. Each of its four sides is perpendicular to two other sides.
Any shape, other than a triangle can have a pair of perpendicular sides.
Sometimes, only if it is a square.
The adjacent sides of a square are perpendicular.
A triangle with a right angle in it is the only case in which a triangle can have perpendicular lines. Triangles themselves cannot be perpendictular unless you are referring to one of the sides being perpendicular to a certain line.