• Tangent[point1, rad1, point2, rad2] generates a pair of lines tangent to two implied circles.
• If a circle of radius rad1 is centered at point1, and another of radius rad2 is centered at point2, then Tangent generates two lines tangent to both circles representing a belt or chain between two pulleys.
• Tangent returns a list of two Mathematica Line objects, so if only one of the two tangent lines is desired, one of the two parts of the list may be extracted.
• The list of Mathematica graphics primitives returned are functions of mechanism location variables.
• See also: Edge, Wheel.
Load the Modeler2D package and define a simple model.
Here we add a new group of graphics to the help model that uses Edge to draw several lines. The absolute location of the new graphics depends on the rules passed to ShowHelpModel.