I’m dealing with a planar Curve, which I’m trying to use to trim away surfaces. I want to trim in the direction perpendicular to the Curve. For exampe, if the Curve is in the XY-plane, it would trim in the Z-direction. It is not oriented along one of my world axes, so I wanted to use the Curve itself to determine the direction that the trim would work in. However, I’m not quite sure what the best approach would be to obtain the perpendicular vector to the planar Curve. How should I approach this? I want to obtain the vector direction of the arrow below.

PS I suppose I could also just straight Extrude it a million miles and then use that to trim anything it passes through, but I figured there was a more elegant solution.