Engineering Drawing
When positioning this feature of perspective projection, the centerline of the cone of visual rays should be directed toward the approximate center of the object:

Station point
Vanishing point
Ground line
Horizon

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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?

It can't be done
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

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