The relationship between the perpendicular line to the other side line is ;
A perpendicular line is a straight line that intersects another line at 90°. A straight line perpendicular to a line that is parallel to another line will also be perpendicular to the corresponding parallel line when extended.
Therefore since the sidelines are parallel any line that cuts through one of the sidelines will also cut through the second line at same degrees when extended.
Hence we can conclude that the relationship between the perpendicular line to the other side line is it is perpendicular to the other sideline as well.
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