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
Horizon
Ground line

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

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