what is the condition of perpendicular parallel lines
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If two non-vertical lines in the same plane intersect at a right angle then they are said to be perpendicular.
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The condition of perpendicular parallel lines is a pair of non-vertical lines in the same plane are said to be parallel if their slopes are the same. Two parallel lines will never cross.
Perpendicular refers to when two non-vertical lines in the same plane connect at a right angle.
If the two alternative angles are equal, two straight lines are parallel to one another. The two straight lines are parallel if the pair of internal angles on the same side of the traversals is supplementary.
EXAMPLE
IF the angle between two lines AB and CD of slopes m1 and m2 is 90°, they are perpendicular.
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