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A line is perpendicular to another if it meets or crosses it at right angles (90°).
It is also means "at Right angle"

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In elementary geometry, the property of beingperpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees). The property extends to other related geometric objects. A line is said to be perpendicular to another line if the two lines intersect at a right angle.
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