Engineering Drawing
Several of the tools used in traditional drafting include the following:

Circle template
45 degree triangle
Parallel straight edge
All of these

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Engineering Drawing
How can the drafter prevent Auto-CAD from placing or stacking another center mark on a circle when adding a diameter dimension to it?

Use the Properties dialog box to turn off the center mark of the dimension
Use the trim tool to take away the stacked center mark
Explode the dimension and then erase the center mark
It can't be done

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