/usr/share/openscad/libraries/MCAD/constants.scad is in openscad-mcad 2014.03-1.
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1 2 3 4 5 6 7 8 | // MIT license
// Author: Elmo Mäntynen
TAU = 6.2831853071; //2*PI, see http://tauday.com/
PI = TAU/2;
// translates a imperial measurement in inches to meters
mm_per_inch = 25.4;
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