
Select Tools > Sketch Analysis from the menu
bar.
Or alternatively, click Sketch Analysis
in the Tools toolbar (2D Analysis Tools
subtoolbar).
The Sketch Analysis dialog box appears. It
contains three tabs: Geometry, Projections /
Intersections and Diagnostic.

Open the Sketch Analysis dialog box again.

Click the Projections / Intersections tab.
The information on this tab displays a full diagnosis of a sketch
geometry. It provides a global analysis of the sketch as a whole, and
specifies whether individual geometrical elements in the sketch are
underconstrained (underdefined), overconstrained (overdefined) or isoconstrained
(well defined):
 Detailed Information: provides a detailed
status/comment on each projection or intersection, on constraints
and so forth.
 Corrective Action
: according to the
analyzed element you select and which is not correct, you will be
able to:
 isolate geometry
 activate/deactivate a constraint
 erase geometry
 replace 3D geometry
 hide all constraints on the sketch,
 hide all construction geometries on the sketch and in the
detailed information area of the Projections/Intersections
tab.
You can see that all construction and intersection elements for
this part have a valid status so you don't have to do anything. 
