How can I define this angle?
Good suggestion, Jerry.
However ( I don't now why) I get the right results if I make the Smart Dimension in this order:
1) Center of the semicircle
2) Top end of the vertical construction line.
3) Center point of the slot
by sketching in the extra construction line and adding relation(s) and dimension(s).
You can use 3 points to dimension an angle. Pick the top end of the vertical construction line, the center of the semicircle, and the center point of the slot.
Very good Jerry I only found out yesterday that you could do this. Its on my one to remember list.
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