Four corners and sides
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If the sides of a rectangle (not rectangular) are X and Y units, then the corner to corner length - the diagonal - is sqrt(X2 + Y2)
cube has 6 sides and a rectangle has four sides
2d rectangle has 4 sides.
A rectangle has four sides whereas a right angle triangle has only three sides.
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.