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Parallel & perpendicular lines. Parallel lines are lines in a plane that are always the same distance apart. Parallel lines never intersect. Perpendicular lines are lines that intersect at a right (90 degrees) angle.
Similarly, you may ask, what is the difference between perpendicular and parallel?
Two lines are said to be parallel when they are equidistant from each other and will never intersect or touch. In simple terms, the slope of two parallel lines is equal. Slope of perpendicular lines, on the other hand, are negative reciprocals of each other meaning the lines cross each other at right angle.
Similarly, you may ask, are train tracks parallel or perpendicular?
The ties of a railroad track are perpendicular to the rails and of the same length. This common length is the distance between the rails. (If parallel lines exist, then railroad tracks in space can go on forever.)
Perpendicular lines intersect at right angles to one another. To figure out if two equations are perpendicular, take a look at their slopes. The slopes of perpendicular lines are opposite reciprocals of each other. Their product is -1!