Function perpendicularLineTo

perpendicularLineTo(fromPoint, toPoint, length): LineXY
Calculates a line of length length that is perpendicular to the line from fromPoint to toPoint and passes through toPoint.
Parameters
- fromPoint: PointXY
  First point
- toPoint: PointXY
  Second point
- length: number
  Length of the line to generate
Returns LineXY
Perpendicular line of the required length.

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