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Fixed circles have no radius point. To generate such a circle, hold
the shift key when defining the radius point, or use the special tool
for this. This will open the settings dialog, where you can enter any
expression for the radius. If the circle is dragged immediately after
the generation, the settings dialog will not open, but the current
size will be used.
Fixed circles can be sized to the distance of two points using any expression. Instead of writing the expression in the properties dialog, the value can be taken from the construction. Either use another expression, or two points, or another circle. for this, use the button "Set size ..." in the settings dialog.
The size of fixed circles can be dragged with the mouse, if the fixed state is released in the properties dialog. If the fixed state is set and the center of the circle is free, the center will be dragged instead.
Related topics: Circles, Reorder points, Syntax for Expressions, Object Properties, Points, Transparency
Next topic: Intersections