# Python | Sympy Segment.perpendicular_bisector() method

• Last Updated : 19 Feb, 2020
In Sympy, the function `perpendicular_bisector()` is used to find the perpendicular bisector of the given segment. If no point is specified or the point specified is not on the bisector then the bisector is returned as a Line. Otherwise, a Segment is returned that joins the point specified and the intersection of the bisector and the segment.
```Syntax: Segment.perpendicular_bisector(p=None)

Parameters:
p: Point

Returns:
bisector: Line or Segment
```

Example #1:

 `# import sympy and Point, Segment``from` `sympy ``import` `Point, Segment`` ` `p1, p2, p3 ``=` `Point(``0``, ``0``), Point(``6``, ``6``), Point(``5``, ``1``)``s1 ``=` `Segment(p1, p2)`` ` `# using perpendicular_bisector() method``perpendicularBisector ``=` `s1.perpendicular_bisector()`` ` `print``(perpendicularBisector)`

Output:

`Line2D(Point2D(3, 3), Point2D(-3, 9))`

Example #2:

 `# import sympy and Point, Segment``from` `sympy ``import` `Point, Segment`` ` `p1, p2, p3 ``=` `Point(``0``, ``0``), Point(``6``, ``6``), Point(``5``, ``1``)``s1 ``=` `Segment(p1, p2)`` ` `# using perpendicular_bisector() method``perpendicularBisector ``=` `s1.perpendicular_bisector(p3)`` ` `print``(perpendicularBisector)`

Output:

`Segment2D(Point2D(5, 1), Point2D(3, 3))`

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