Why do we call perpendicular line perpendicular
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because perpendicular line made right angle
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Perpendicular lines are lines that intersect at a 90-degree angle. So, for example, line ST is perpendicular to line CD. ... And we know that they intersect at a right angle or at a 90-degree angle because they gave us this little box here which literally means that the measure of this angle is 90 degrees.
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