About the Delete Command
Deleting sketched elements affects associated features.
This is what we call 'propagation':
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If you delete a curve (assigned endpoints, by default),
the endpoints will also be deleted on the condition they are not part
of a constraint or common to another curve. Curves are assigned endpoints
and circle or arcs are assigned center points, by default.
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If you delete a curve and the endpoints/center point,
these points will be actually deleted is they are not either part of
a constraint or common to another element.
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Propagation is not valid for constraints: if you delete
a constraint, you will not delete the corresponding geometry.
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If you created an element using Sketch
tools options, constraints are applied to this element:
If you delete this element, associated constraints will be deleted too.
Conversely if you delete one, several or all the associated constraints,
the element will not be deleted.
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You cannot delete elements that are not currently edited
sketch elements. This is particularly true for the reference planes.
You can multi-select these elements but they will not be deleted.
Deleting Points
Deleting sketched elements affects associated features. This is what
we call 'propagation' .
By default, the circles and arcs you create are assigned center points.
If a point is defined as the center point of a circle or arc (explicitly
or using concentricity constraints), when deleting the corresponding circle
or arc, the center point is deleted along with it.
In Drafting apps, if you create a circle (or arc) with no constraint
detection (for more information, see Create detected and feature-based constraints option), when deleting
the circle, the system does not delete the center point.