Circle
======
+The feature Circle creates a circle in the current Sketch.
-.. image:: images/Circle1.png
- :align: center
+To add a new Circle to the Sketch:
+
+#. select in the Main Menu *Sketch - > Circle* item or
+#. click **Circle** button in Sketch toolbar:
+
+.. image:: images/circle.png
+ :align: center
.. centered::
- Create circle by center and point
+ **Circle** button
+
+There are 2 algorithms for creation of a Circle:
+
+.. image:: images/circle_pt_rad_32x32.png
+ :align: left
+**By center and passed point** creates a circle with the given center passing through the given point.
+
+.. image:: images/circle_3pt_32x32.png
+ :align: left
+**By three points** creates a circle passing through the given three points.
+
+By center and passed point
+""""""""""""""""""""""""""
+
+.. image:: images/Circle_panel_pt_rad.png
+ :align: center
+
+Click in the view once to set the center point, then move the mouse and click a second time to set the passed point.
+
+- When entering a center point by selecting either a point or a segment, a Coincident constraint is created.
+- When entering a passing point by selecting a point, a Coincident constraint is also created.
+- When entering a passing point by selecting a segment, a Tangent constraint is created.
+
+**TUI Command**: *Sketch_1.addCircle(CenterX, CenterY, PassedX, PassedY)*
+
+**Arguments**: 4 values (coordinates of the center and the passed point).
+
+By three points
+"""""""""""""""
+
+.. image:: images/Circle_panel_3pt.png
+ :align: center
+Click in the view once to set the first passed point, then move the mouse and click a second time to set the second passed point
+and finally move the mouse and click a third time to set the last passed point.
-.. image:: images/Circle2.png
- :align: center
+- When entering a passing point by selecting a point, a Coincident constraint is created.
+- When entering a passing point by selecting a segment, a Tangent constraint is created.
+
+**TUI Command**: *Sketch_1.addCircle(X1, Y1, X2, Y2, X3, Y3)*
+
+**Arguments**: 6 values (coordinates of three points).
+
+Property panel in edition context
+"""""""""""""""""""""""""""""""""
+
+The following property panel appears when the user selects an existing circle.
+
+.. image:: images/Circle_panel_edit.png
+ :align: center
+
+Note that the edition property panel does not show the used creation algorithm.
+
+The panel shows:
+
+- center coordinates and radius (read-only).
+- auxiliary flag (can be modified).
+
+Result
+""""""
+
+Created circle appears in the view.
+
+.. image:: images/Circle_res.png
+ :align: center
.. centered::
- Create circle by tree points
+ Circle created
+
+**See Also** a sample TUI Script of :ref:`tui_create_circle` operation.
