Pi Ruler
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A tool for rectifying circle segments and "cheating" at constructive geometry.
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Model information
- Source
- Printables
- Category
- Math
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
A ruler with holes spaced at centimetre intervals and 0.5 π centimetre intervals, so that you can easily get a straight line segment equal to the circumference of a circle, given a radius or diameter in whole units. To rectify a circle with diameter n, hold ruler in place, and mark with a pencil within hole 0 π and n π, then connect the two dots with a straight line. I have included half-pi units so that you can also work from a given radius, as well as to make the lower half less sparse.
Pi is approximated to however many digits Google Sheets' PI() function returns, so if your hand-drafted design requires greater precision lest a bridge collapse, please use a different tool.
I have included one that measures up to 30 cm, and another that measures up to 16 cm, which can fit onto the Prusa MINI's build plate. I would recommend waiting for it to cool on the build plate before removal, to avoid warping the plastic.