Revert "Corrected calculation of arc length"

This reverts commit eadbae2.

src/ansys/motorcad/core/geometry.py

@@ -1164,7 +1164,19 @@ def length(self):
         float
             Length of arc
         """
-        return abs(self.radius * radians(self.total_angle))
+        radius, angle_1 = xy_to_rt(self.start.x, self.start.y)
+        radius, angle_2 = xy_to_rt(self.end.x, self.end.y)
+
+        if self.radius == 0:
+            arc_angle = 0
+        elif ((self.radius > 0) and (angle_1 > angle_2)) or (
+            (self.radius < 0) and angle_2 < angle_1
+        ):
+            arc_angle = angle_2 - (angle_1 - 360)
+        else:
+            arc_angle = angle_2 - angle_1
+
+        return self.radius * radians(arc_angle)
 
     def reverse(self):
         """Reverse Arc entity."""