Assembly3 ConstraintArcLineTangent
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| 
 | 
| Menu location | 
|---|
| None | 
| Workbenches | 
| Assembly3 | 
| Default shortcut | 
| None | 
| Introduced in version | 
| - | 
| See also | 
| None | 
Description
The  Arc line tangent command builds a link between two objects of an assembly. The selected elements of each object or more precisely their implicit coordinate systems (ICS) are used to position one object to another.
Since I couldn't get this tool working here's just the statement of the tool tip:
Add an "Arc line tangent" constraint to make a line tangent to an arc at the start or end point of the arc.
Usage
- Place two objects into an assembly
- Select an arc element of one object
- Select a line element of the second object
- Press the Arc line tangent button. 
Depending on the order of the selected lines following errors appear:
Constraint "ArcLineTangent" requires the 1st element to be a circular edge Constraint "ArcLineTangent" requires the 1st element to be an arc edge
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