Toolbar: 
Constraints toolbar 

Menu: 
Add menu > Geometry submenu> > Constraints submenu > Add Coincident 

To add: 
Click Add Coincident Constraint, then click:


To delete: 


Result: 
If the two sketchelements have a total of more than two degreesoffreedom:
 or 
 or 
Note: If the two sketchelements have a total of 1 degreeoffreedom, then the two sketchelements cannot become 'coincident'. 

In MechDesigner, you cannot remove more than two degreesoffreedom from a Point. For example, you cannot do these two steps:
Why:
Thus, delete the constraint between the Point and the Line (STEP 1), before you add the constraint between the two Points (STEP 2). About Point Symbols
You may need to select the '+' or the 'O' with a command, and it is important to see the difference between the two Points and be able to select one Point or the other Point. When a centrePoint is Merged with a startPoint or endPoint of a Line or Arc, the symbol is a '+'. You cannot select one or the other, because there is only one Point.


See Also: 

Notes: 
Use Add Coincident between two Points for construction geometry. Use MergePoints for sketchloops and sketchpaths. Points that are 'coincident' give you the option to delete the Coincident Constraint later. 
Before 
After 
Select: 
In SelectionWindow & GeometryTree as... 


The Lines become collinear 
CoincidentLtoLn 


CoincidentPtoLn 





The Point is constrained to lie on the circumference of a Circle 
CoincidentPtoCn 

The Points become coincident 
CoincidentPtoPn 