# Selecting edge of a circle in Solidworks

When I am drawing things (Assembly) in SolidWorks, on some parts which I work on, I can select the edge of a circle and then measure the dimension to a line, like shown below:

But the problem is that on some others I simply can't. It won't allow me to select the Edge of a cirlce when I hold down the SHIFT key. If I "insist" and drag the measurement to an edge, it jumps to the other end, like shown below:

I think I'm doing everything right: Doubleclick Sketch to edit it, select a line, then hold SHIFT and then try selecting the edge of a circle. I already searched on the internet around, but no one had really a solution for it. The closest I came was this.

Why does it work on some projects and on some others it don't?

Any help is greatly appreciated.

EDIT: I'm using SolidWork 2016 Premium x64 (SP 0.0)

• I can't quite recall, I now use NX, but does Solidworks have selection filters? – Petrichor Feb 8 '18 at 11:37
• @Petrichor Yes, it seems so (help.solidworks.com/2014/english/solidworks/sldworks/…) – Fusseldieb Feb 8 '18 at 11:40
• @Petrichor Even using filters, it won't let me select the edge and if I use SHIFT, the selection disappears completely. – Fusseldieb Feb 8 '18 at 11:50

• Thanks. Works just fine - finally. I personally prefer the second option, as the first seems like a little 'hack', but one last question: is that it's not good practice to dimension a part like this What do you mean with that? I didn't quite get it. – Fusseldieb Feb 9 '18 at 11:39