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This symbol ⊥ means "perpendicular." It might say line AB ⊥ CD and means line AB is perpendicular to line CD. It means the two lines meet at a right angle. Imagine it as two lines meeting to form an exact plus sign, with 90 degree angles all around. Parallel lines use the symbol || and are lines that never touch each other no matter how much we extend them. For example, if lines AB and CD are parallel, we can write AB || CD. | Laurel County Adult Education and Literacy | Facebook
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