Inferencing
Inferencing displays relations by means of dotted inferencing lines, pointer display, and highlighted cues such as endpoints and midpoints.
Inferencing lines
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Inferencing lines appear as you sketch, displaying relations between the pointer and existing sketch entities (or model geometry).
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Pointer display
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The pointer display indicates when the pointer is over a geometric relation (an intersection, for example), what tool is active (line or circle), and dimensions (angle and radius of an arc). If the pointer displays a relation (such as  for a horizontal relation) and you click to accept the sketch entity while the relation is displayed, the relation is added automatically to the entity.
NOTE: You can turn off automatic relations. Click Tools, Sketch Settings, Automatic Relations.
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Highlighted cues
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Geometric relations such as endpoints, midpoints, and vertices highlight when the pointer approaches them, then change color when the pointer is poised to select them.
On the left, a midpoint highlights and the pointer shows that a coincident relation  is possible at its current position. On the right, the midpoint has changed color and the pointer shows that it recognizes the midpoint  .
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