They are simply four pairs of perpendicular lines. There is nothing in the question to suggest there is anything more than that to them.
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Perpendicular to what? Four pairs cannot be mutually perpendicular unless you go into hyperspace.
Yellow
no
a squareof course
The rectangle has four corners.Every corner is a right angle.Every right angle is a place where two perpendicular lines meet.Looks like the rectangle has four pairs of perpendicular sides.