When you are dimensioning a drawing with a slot, do you need to show the center lines of the slot and not the radii?
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Under the Annotate Tab, pick Centerline Bisector.

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Pick both nodes at the quadrants of the slot as shown below.

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This will create a center line between the two nodes of the slot. Do the same thing for both flats of the slot; this will create a center line between the two lines. This gives you center line of the slot that you can now dimension to.
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