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aha moment,:thumbsup: got it, the top of the crown.
Which makes sense the larger the inside cabinet angle the smaller the crown angle.

Thanks....starting stuff this weekend....pulling down old crown from a room that is being renovated....will look at those cuts and use those pieces for testing.
 

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I guess I'm glad I do not know much about math! BUT I cut those inside corners you see in the pic by cutting with my saw set at 22.5 you can see the top of the corner the cut angle are less than 90 less than 45 they are 22.5

but yes you are right these actual inside corner angles are larger than 90 as you label them so they must be 135 degrees

I do not understand why this works but it does. if you have a LARGER corner angle you set your miter saw for a SMALLER angle
If you cut two short pieces of moulding at 90* and place one on each side of the corner cabinets, you will see why that has to be CUT at 22.5* not matter if the actual angle of the cabinet is greater than 90*. It makes each side of the angle 67.5* which adds up to 135
 
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