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Finding center or midpoint of a slot.


New member
Hello, first time poster here,
I am VERY new to Catia and am attempting to generate a drawing from an existing IGES file. I seem to be getting the hang of it fairly quickly, for me anyway, but I haven't figured out why I'm getting these angle callouts. I need to dimension to the center of the slot but can't figure out how to generate a line in the center. I'm fairly sure the dimension should be 22.5°, but it can't be the same for each side of the slot. Thanks in advance for your help. I'm sure I will probably spending a lot of time here!