Placing an equilateral triangle within a circle using LightBurn

Is it a tip or is it a trick? You decide. :slight_smile:


Fun with geometry…

That’s pretty cool.

In math class, we were required to show the proof, step by step. I loved that kind of work, but have totally lost it now.

Nice job @Stroonzo! And that voice…like butter, my friend. :slight_smile: What do you have on the list for your next ‘Tips and Tricks’? :wink:

(thank you, very helpful)

I’m still thinking about that one.
Kind of like is math a discovery or an invention?

If you’ve got any more of those trick tips I’m in your audience!


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We have a winner!

Perfect example of ‘use it or loose it’ :slight_smile:

So, this was a trick for me personally a few weeks ago when I was drawing a replacement router base plate needing to have three screws evenly distributed along a circumference.

In most cases, I’d reach for the circular array tool, but there was something (I don’t even remember what now) that I had to double check using this old compass and ruler trick.

See here that circular array of the top smaller circle builds the same snap points of an equilateral triangle:

I’ll certainly make additional short tips in the future when I suspect that something I am doing could help others.


I get bored sometimes and as a joke make fake commercials like this:

Microsoft PowerApps Blurb


That’s a great method.
I use a simple one if I need to do that: just draw a hexagon.
Then draw 3 lines connecting every second corner - that’s your equilateral triangle.
Then draw a circle of the same radius dimensions as the original hexagon, and align it over the top of the triangle.

I did the circular array for a 5 point star. Took forever to figure out how to delete the lines inside the star. I’m still not sure how I got rid of them it but it worked.

Using the node editing tool, hover the mouse over the interior lines. Press the “T” key on the keyboard to trim the line.

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Faster still:

Create a hexagon with the same center, width, and height, then just change the number of sides from 6 to 3.

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This is why I always preface any demo with something along the line of “here is one approach”. I am always amazed at the multitude of techniques possible as a means to an end. Certainly a testament to the adaptability that LightBurn offers to its user base.

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Not intended as a “you’re doing it wrong” by any stretch - I didn’t realize that the intersection points would give you two points on an equilateral, and it was a good illustration of using shape crossings as snapping points when drawing. (in hindsight, the math totally makes sense)

I spent 12 years teaching community college various computer languages. Grading (or trying to) I used to ask student’s how they went down the path they did, sometimes it left me wondering…

Every body working on their own generally did it differently.

A good reason for hammering on them to document their work in the source. It became very clear when I had a relatively technical modification for their programs as an assignment. Then they learned they were modifying one of the other students code. Noticed a lot more useful comments in the source after that… :slight_smile:


I learned to comment in college. I submitted a final project in DBase 4 that was 3 printed pages long, and the prof had never seen it done in less than 10. DBase didn’t have a stack, so it wasn’t possible to write recursive code in the normal way.

Everyone else copied their main function 3 times, and made them call 1 to 2, then 2 to 3. Mine implemented a stack. I got the assignment back with the uncommented stack code circled in red with “what does this do??” next to it. Bonus points awarded for the clever solution, docked points for having no comments. :slight_smile:

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I dislike the small amount of extra effort to comment my code or scripts (BUT… not nearly as much as I dislike NOT commenting and having no idea what I was thinking when I was developing, the context of the intent, or what the upstream or downstream dependencies are). :slight_smile:

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