Intersection Cons Line/Real Line (INCR) ( Modeling & Drawing Editor )
Tool summary :
Also see :
 Modeling and the Drawing Editor (where INCR can be found)
 Lines ( INCR can find intersections of construction lines/circles with)
 Polygon sides ( INCR can find intersections of construction lines/circles with)
 Arc ( INCR can find intersections of construction lines/circles with)
 Circle ( INCR can find intersections of construction lines/circles with)
 Construction line by designating two points
 Construction line by defining a point and an angle
 Point location target (shows the point's position)
 XYZ display (shows the point's coordinates)
 Noticed points & temporary construction lines (may be created with INCR )
 Offset Controls (affect INCR )
Examples :

For second point location with INCR , a temporary construction line may be generated at 45° increments through the noticed point that is closest to the real line ( line or polygon side ). 
The green pointers in this illustration show intersections of construction lines with polygon sides . INCR could be used to locate a point at any one of these intersections. It can also be used to locate a point where a construction line intersects a line . 

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Locating a point using INCR :
1 . Invoke Construction Line Add or Add Bevel Symbol or Add Line or any other tool that permits the use of INCR as a Locate option.
2 . Various Locate options become active, and the status line prompts you to locate a point.
2a : Select the INCR icon , or choose Locate > Intersection Cons Line/Real Line .
2b : Place the mouse pointer ( ) so that the point location target ( ) snaps to the point of intersection of a construction line or construction circle with a line or a polygon side or an arc or a circle that is nearest to the mouse pointer. The XYZ display shows the coordinates of the point. Leftclick ( Locate ) to locate (place) a point at the center of the target.
2c : Continue to perform the operation you began in step 1.
Tip: For second point location in the operation you began in step 1, you can optionally type in a distance and/or angle to constrain the second point to the typedin distance/angle from the first point. The distance/angle you type will be shown in brackets [ ] in the status line .