PerpendicularVector Command

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PerpendicularVector[Line]
Returns the perpendicular vector of the line.
Note: A line with equation ax + by = c has the perpendicular vector (a, b).
PerpendicularVector[Vector v]
Returns the perpendicular vector of the given vector.
Note: A vector with coordinates (a, b) has the perpendicular vector (-b, a).
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