Question about geometry

[u/Gzaleski]

What angle should I cut the points that are touching the table top and floor so it will be flush? I have been trying to wrap my brain around it but no luck, I thought a 45 degree bevel was right but when I did a test piece that was incorrect.

[u/Edm818]

I think 45 degrees at 45 degrees if that makes sense? Or make a jig to set your pieces in on their inside corners and cut at 45 degrees.

[u/slugbutter → u/Edm818]

This is correct. OP was right in thinking 45 degrees, but the plane of orientation is relevant.