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Post Your 50-word Response To The Following: How Can You Determine If Two Lines Are Perpendicular?

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Oddman answered
Choose from
1. Two lines are perpendicular if the dot product of their direction vectors is zero.

2. Two lines are perpendicular if the product of their (non-zero) slopes is -1. If one has a zero slope, the slope of the other must be "undefined" and vice versa.

3. Two lines are perpendicular if the angle between them is 90 degrees.

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