- [Instructor] When working in sketches,
it's important to understand the relations
that exist inside of each sketch.
Here I've just laid out some random sketch entities,
but you can see already in the green boxes
all the various relations that these have.
This is just a corner rectangle, a center-point rectangle,
a slot, a circle, and a polygon.
Now you notice as I click on each one of these,
in the left hand side of the Property Manager,
we get a list of existing relationships
and what relations can be added.
So if we pick this circle, for example, we can fix it,
but once we hold down Control and select this line,
we can now create an equal curve length relation
or a tangency relation.
We can go into the Existing Relations window,
right click and delete
if we don't want to maintain those relations.
If at any point we have failures in our sketch
and we want to find out what's going on,
we can go up here to the Display Delete Relations option.
Click on that and it shows all the relations
that exist inside the sketch.
We can sort these by Dangling, External,
Overdefined or Not Solved, and a few other options.
We can also go by selected entities,
which is sometimes useful when you want to see the relations
that exist between two specific parts.
If you don't understand how the relations work,
you're not going to understand what to do
when certain geometry gets locked into place.
You always have the option of fixing things,
but generally, whatever you select,
SolidWorks is going to give you some automatic options
for creating relations like horizontal and vertical
in the case of this line segment.
Be sure to look through all the potential relations.
In this polygon, for example,
the circle inside has a tangent relation,
but the line on the outside has a patterned relation
because it has a patterned line around this arc.
So just because it's a single entity doesn't mean
it doesn't have its own relations already inside of it.