ok the corners are 45 degres and the external corners are also 45 degres.
If you have a bay window the angles are 35 degres. On most saws the handle is a square line and if you look the corner is cut off the square and that is your 45 degres. I hope this makes sense as it is 10 to 1 in the morning and I have had a skin full.
Cheers good luck
Bobby