Straightening lines

Hi, I’m a student and quite new at this. When I make a shape using the line tool, lets say a trapezoid, in the front or back view, it isn’t a straight line in top view. How would I fix that automatically instead of fixing, manually, every dot?

SetPt command can be used to set objects to have the same x, y or z values. https://docs.mcneel.com/rhino/6/help/en-us/index.htm#commands/setpt.htm

Setting Planar to On can help keep points on the same plane.

See the User’s Guide, particularly Chapter 6 Accurate Modeling for more on how the Rhino interface works and how to create geometry. Straightening lines

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Ohh the setpt-command FINALLY allows me to straighten traced lines instead of redrawing them all myself. I wish there was another smarter way to do it but now this is very viable.