fixing ruff errors

Author: meg-1

Diff for: geometry/shapes/polygon/polygon.py

@@ -8,7 +8,8 @@ class Polygon(ClosedShape, IntersectSelfShape):
     """
     an abstract class which represents a
     set of polygons on a 2D surface
-
+    
+    >>> from geometry.angles.angle import Angle
     >>> polygon_one = Polygon()
     >>> side_length = 15
     >>> angle_degrees = 60

Diff for: geometry/shapes/shape_types/open_shapes.py

@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
-from geometry.shapes.shape import Shape
 
+from geometry.shapes.shape import Shape
 
 class OpenShape(Shape, ABC):
     """