Lines that form a 90 degree angle at their vertex. Two lines that make a 90 degree are perpendicular.
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If the angle formed between the intersecting lines are 90o then the two lines are perpendicular. In 2D coordinate geometry, a perpendicular line has a slope equal to the negative reciprocal of the original line.
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2d
Well, isn't that a happy little question! A heptagon, with its seven sides, can have a maximum of seven perpendicular lines. Each side can have one perpendicular line drawn from it, creating a lovely pattern of right angles within the shape. Just remember, there are no mistakes, only happy little perpendicular lines waiting to be discovered!
No. Perpendicular lines for right angles. That is why they are called perpendicular.