two parallel lines are crossed by another line ,that's the perpendicular.
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Railway lines with sleepers? Lines of latitude crossed by a line of longitude?
They don't always. When two lines are crossed by another line (called the transversal) the angles in matching corners are called corresponding angles. If the two lines being crossed are parallel lines, then (and only then) the corresponding angles are equal.
When two lines are crossed by another line (called the Transversal)
Lines that are equal distance from one another and never intersect are said to be parallel lines.
A transversal line cutting through parallel lines creates various angles