If lines were not perpendicular,they would either be intersecting or parrallel.
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Perpendicular lines are a possibility. This will only happen if the intersecting lines are exactly 90 degrees from each other.
Orthogonal lines or perpendicular lines
A rhombus has parallel lines but no perpendicular lines.
No. If the lines are parallel they will never meet or intersect at any point. If the lines are perpendicular they do intersect, but perpendicular lines are a special case of intersecting lines. Perpendicular lines are exactly 90 degrees from each other. Intersecting lines do not haveto be perpendicular... but perpendicular lines are always intersecting.
An example of a perpendicular line is a 4 way intersection at a stop sign. Another example would be a window that has 4 smaller squares in it.