:param real: Passed Y.
:return: Result object.
-By tangent point and point
-""""""""""""""""""""""""""
+By tangent point and end point
+""""""""""""""""""""""""""""""
.. image:: images/Arc_panel_tang.png
:align: center
:param boolean: Is inversed.
:return: Result object.
-By transveral point and point
-"""""""""""""""""""""""""""""
+By point on perpendicular line and end point
+""""""""""""""""""""""""""""""""""""""""""""
.. image:: images/Arc_panel_perp.png
:align: center