Contact, Two objects are touching each other, Parallel, When lines are parallel, they run alongside each other without crossing or intersecting, Tension, Feeling stressed or nervous. It refers to the force exerted by a string, cable, rope, or any other flexible object that is being pulled or stretched., Perpendicular, When lines are perpendicular, they cross or intersect each other, Normal, -Common, not extraordinary. In math, normal is a line that is perpendicular to another line..

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