Parallel lines
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perpendicular lines no dur
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Shapes are not parallel or perpendicular. Lines are.Every side of a rectangle is parallel to the side opposite it,and perpendicular to both of the sides next to it.
Perpendicular is when opposite angles that are formed when two lines intersect and are congruent called?
That the slopes of the lines are the opposite of each other and negative. Ex: y=2/3x+b then the line perpendicular to it is y=-3/2+b