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If you measure the angle between them and it's exactly 90 degrees, then they're perpendicular.

That's the definition and the requirement.

Perpendicular lines form a "corner", but if you want to be technical about it, that's not

a good way to tell. The angle might be only 87 degrees, or it might be 92 degrees, and

when you look at it, it may look like a corner. But technically, if it's not 90 degrees then

they're not perpendicular.

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Q: How can you tell when two lines are perpendicular?
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