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Square of Thales
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A simple tool use to determine if a corner is square.
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- Printables
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- Tools
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- Creative Commons — Public Domain
A practical application of Thales Theorem: Any triangle inscribed in a circle and that has it's hypotenuse as the diameter of that circle is a right triangle.
Because the ends of all three arms lie on a circle, they also form a right triangle.
This is a handy way to quickly determine if a corner is square.
I got the idea from a youtube video by Steve Maskery
The 2 pieces are held together by a 5 mm machine screw. I used a M5 x 10 mm. A shorter Flathead M5 could also be used.