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If I have two arbitrary points (not aligned with any particular axis), is there a way to make a square using them?

For example, if I have two points along the X axis, I can select the edge between them, E to extrude it, Y to constrain, and type in the length to make a square.

two points

extruded square

Can anyone help me do this if the points are not alined on the X or Y axis?

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    $\begingroup$ double press the axis letter. That will make it move along the local normal. $\endgroup$ – VRM Jan 8 '15 at 17:31
  • $\begingroup$ @NoviceInDisguise: this seems to constrain me to the local x (or y or z) axis, not the normal direction to the two points. $\endgroup$ – user1717828 Jan 8 '15 at 21:38
  • $\begingroup$ I meant local/normal, sorry. There is a setting at the bottom of the viewport to change which. $\endgroup$ – VRM Jan 9 '15 at 2:15
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With the edge selected open up the properties pane with N Scroll down to the Mesh display section and turn on Length for the Edge Info.

Now press E to extrude, then press YY to constrain the movement to the Y Normal axis. Pressing XX or ZZ would lock movement to each their respective axes. Finally before you confirm the movement, type in the length of the first edge.

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