Engineering Drawing
In perspective drawings this is placed between the observer and the object:

Station point
Plane of projection / picture plane
Ground line
Vanishing point / horizon

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Engineering Drawing
Given a situation in which the drafter has crossed extension lines in a drawing what can be done to clean up the point of crossing?

Use the Modify tool to clean up the extension lines
Use the stretch tool to clean up the extension lines
Use the Tolerance tool to clean up the extension lines
Use the Break tool to clean up the extension lines

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