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Tangents

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Tangent lines are lines that smoothly meet an arc or circle. You can draw a line tangent to one or two circles or arcs. For example you might need a tangent line in designing a mechanical cam.

https://www.youtube.com/watch?v=rubEY94IvbM
 
To draw lines tangent to one curve:
  1. From the left toolbar enable Snap to Lines.
  2. Draw a straight line starting away from the curve. When you approach the tangent point, the line will snap to the tangent position.
 
 
To draw lines tangent to two circles or arcs:
  1. Select the two curves.
  2. Choose Line | Tangents. All possible tangent lines will be created.
  3. Delete unnecessary lines.
 

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