Draw more accurate circular Arcs for larger angles (#4034)

Co-authored-by: Benjamin Hackl <[email protected]>

Author: chopan050

manim/mobject/geometry/arc.py

@@ -394,8 +394,9 @@ def _set_pre_positioned_points(self) -> None:
         tangent_vectors[:, 1] = anchors[:, 0]
         tangent_vectors[:, 0] = -anchors[:, 1]
         # Use tangent vectors to deduce anchors
-        handles1 = anchors[:-1] + (d_theta / 3) * tangent_vectors[:-1]
-        handles2 = anchors[1:] - (d_theta / 3) * tangent_vectors[1:]
+        factor = 4 / 3 * np.tan(d_theta / 4)
+        handles1 = anchors[:-1] + factor * tangent_vectors[:-1]
+        handles2 = anchors[1:] - factor * tangent_vectors[1:]
         self.set_anchors_and_handles(anchors[:-1], handles1, handles2, anchors[1:])
 
     def get_arc_center(self, warning: bool = True) -> Point3D: