Add a Circle
This mode allows the creation of a circle given by its center and a point on its circumference. The mode generates the circle together with the two points with just one mouse click. When the mouse is pressed, the center is added. Dragging the mouse generates the circumference point and the circle. When the mouse button is released, the position of the circumference point is frozen, and the construction is finished. The logic behind this mode is analogous to that in add a line mode.
Constructing a circle in this mode can be described as a three-step procedure:
Add a circle mode creates a circle with a press–drag–release sequence.
The "shape" of a circle depends on the choice of the geometry.
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