Hi Matadem,

> In order to get the triangles into a certain shape I needed trim (I do not know if this
> is the best way to do this)
> Is there a better and more efficient way to do this?

Yes, Boolean intersection can be more efficient because it will automatically figure out which pieces are contained inside the outline. So you won't have to pick which pieces to discard like you do with Trim.

Select the pieces you want to cut, then run Construct > Boolean > Isect (short for Intersection), then select your closed outline curve:





- Michael