Perpendicular lines are lines that intersect at a right (90 degrees) angle.
Perpendicular lines are two or more lines that intersect at a 90-degree angle, like the two lines drawn on this graph. These 90-degree angles are also known as right angles. ... When the lines are parallel or perpendicular, text will appear to let you know you've done it! o Look at the slopes of the two parallel lines.
To start, all you need to remember is that perpendicular lines intersect at a 90º angle, and that a straight angle measures 180º.
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Explanation:
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