I am trying to create a 90 degree angle from two pieces of wood so that I can eventually create a squared enclosure. I have cut two pieces of wood at 45 degrees with a circular saw's angle adjustment.
However, when I try to join the pieces of wood, they only meet at their tips and not throughout the slope of the cut (see photo below). Because of this, I can't figure out how to nicely join them together while ensuring that they will have a 90 degree angle when they are merged.
What is the recommended way join wood in this way to create flush 90 degree angles for a squared enclosure? Is it possible to do this with a circular saw?