What angle do you cut trim for a corner?

Online Answer
For most DIYers, fitting baseboard moldings on the interior corners of the room is best accomplished with miter joints—45-degree miter cuts to each adjoining piece of molding. When fit together, these corners make 90-degree angles.
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A corner provides attachment points with some air between them. Imagine a spider building a web in the middle of a blank wall. The web would end up lying flat on the wall, which is not very useful for catching flying insects..
45-degree angleUsing a miter box or a power miter saw, cut the baseboard at a 45-degree angle. Before nailing it in place, mark the second piece the same way, and test for fitting. Use 1-1/4" or 1-1/2" brads to close the corner. When you encounter the doorway, measure the distance between the door casing and the wall..