How can I create a line in ArcGIS 9.3 to a specific length?
I click once to start the line where I want it, and then I want it to be, say 10 Meters in length ... Similar to AutoCAD.
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After you click to start the line, right click to open the edit tool's context menu. On this menu is a button named Length. Clicking this button opens a dialog that lets you set the length of the line segment. There is also a button for doing Direction/Length.
After you click the first time you can either use the context menu as Zachary suggested or what I find quicker is to use the shortcuts: Ctrl + L for Length Ctrl + A for angle (or direction), Ctrl + G for both at the same time and F2 to finish the sketch.
When you digitize the polyline
Here is a tutorial: https://youtu.be/CvvCH8Ze7m0