Greetings fellow DIY'rs,

I am attempting to solve this problem here to line up the cove moulding. Any help would be greatly appreciated!

 

Are you asking how to make a miter cut?

 

I should have specified further. I understand this can be solved with a miter. I am unsure of how to solve for the angle

 

You would usually find the angle with a miter gauge or a sliding t bevel. Assuming you don't have either, take 2 business cards and place them on the ceiling, one on each side. Slide them together until they overlap and the tip on each card meets. Tape them to the ceiling. Then mark the short point (where they overlap by the cabinets) and draw a line from that short point to the tip where both cards meet at a point.

That line is bisects the angle. Cut it with a scissors. That is the angle you will put on each piece. One is a right miter, one is a left miter.

It should be close to 22.5 degrees if the cabinet is sitting at a perfect 45 degree angle.

 

Its going to have a shape like this!