Use the elements in the dialog box to modify the parameters of an arc intersection.
Specify the arc by a center point P1 or P2 and a radius.
Coordinates of the center points. You can edit the coordinates in the dialog box or use the Graphic icon to select another point.
Radius of the arcs. You can edit the value in the dialog box or use the Graphic icon to define it in the drawing.
If intersection type is Tangentials you can enter a radius. Set Radius to NULL or 0 for straight line tangents.
I1
Use the Reverse icon to change between intersection type Points or Tangentials.
I2
If you calculate tangents with a radius you can use the Show Next Reverse icon to show all possible locations of the tangential arc.