Set slope value for roof - inaccuracies

Hi,
its friday and i don’t understand this problem;)
Could some tell me, why the slope is not set correct and how i can fix this?



I try to set the slope to (10°,45°,10°,45°) but in Revit i get the result: (9.9,38.15,9.9,38.15)
Here are some links about this topic…but I do not understand it:(

ok, now i got it:)