How do you make specific angles for triangles, trapezoids, etc?

I was asked to make a triangle wallet that was basically 4 equilateral triangles that fold onto one another. After attempting to figure out how to get precise angles to make each corner 60 degrees I ended up just copy and pasting an image of a triangle from a Google search and then tracing it and then drawing with the line tool from point to point of the traced one(traced objects never have perfectly straight lines) Is there a way to create exact angles? The only thing I noticed was the indicator at the bottom that reads the current angle but it changes if you rotate the item and it goes away once you place the line.

I use the create polygon tool. Then I go to shape properties. I then select how many sides I want.

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So you can select how many sides but not the angle of each? I’m asking about making specific angles.

For regular polygons, those are dependent.

In a regular polygon with n sides:

Interior Angle = (n - 2) × (180 / n)

  • Triangle = 60 = (3 - 2) × (180 / 3)
  • Square = 90 = (4 - 2) × (180 / 4)
  • … and so on

For irregular polygons, the angles are whatever you get based on the layout you want.

To generate a line at an arbitrary angle, draw a horizontal line (parallel to the X axis) of the desired length, use the Numeric Edits toolbar to rotate it as needed, then drag-and-snap it into place on the polygon you’re creating.


I suggest you to use some free CAD (there are a few), make a sketch of the triangle and set the angles and lenghts as you wish. You can the export the shape as a DXF file into LB or produce a drawing of it and export as svg to LB.
LB does not have the possibility to measure angles.

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This would’ve worked for this specific project where I needed the equilateral triangle but I was wondering about an angle tool

This is pretty much what I expected, but I wanted to make sure I wasn’t missing something. Thank you!

Thanks. This seems like a more complicated process than inputting the angles on a shape generator/calculator. I will still give it a try though

If you knew the degrees you could use the circle array then connect the intersections with the pen tool.

One way is to draw a line, set the length, go to edit nodes press L to make sure its straight, press A to align horizontally. Then exit out of node edit and set your angle, duplicate and mirror. Use alt to help you connect the three sides.

I was thinking the same. I’d probably suggest something parametric such as FreeCAD or Fusion rather than ‘dumb’ CAD. For simple 2D parametric sketching I think FreeCAD would be simpler to get up and running with as it doesn’t require an account to be set up (unlike Fusion).

FreeCAD sketch:

FreeCAD sketch exported as DXF then imported into LightBurn

Hope this helps.

The “make a line, duplicate it, then rotate the duplicate” method is likely the easiest method to make arbitrary angles directly in the LightBurn UI, but you know the classic trope of a student asking their teacher, “When will I ever use this?” Well, if you ever asked that about sines and cosines, we found the answer! :smiley:


I still use the three trig functions extensively when I’m designing things. Being able to quickly math out a number using sin/cos/tan and right triangles is a really great skill to have, although with the tools we have available, you don’t need to know how to throw algebra around to make things.


Great for those of you that didn’t fail algebra and hence couldn’t even go on to geometry.

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