Smart Edge (2D Only)
With the Smart Edge constraint on, the SmartCursor finds points on, or at a certain distance away from, a specified edge.
 
1.
The Edge Snaps dialog box opens.
 
To set an edge manually, move the mouse over the edge and press the T key; alternatively, move the cursor to the edge and move slowly along its side. When the edge is set, a Smart Edge extension line cue displays. The SmartCursor will intersect the extension line with the other objects and snaps to find a number of points.
2.
Click OK to set the Smart Edge options.

SmartCursor and Constraints : The Constraints Palette : Smart Edge (2D Only)

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