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doowb/radius.js

Created May 30, 2014 19:09
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Radius from Area
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radius.js
var radius = function (area) {
// make the area bigger so we get better values for small areas
area = area * 10000;
// a = PI*r^2 => a/PI = r^2 => sqrt(a/PI) = r
return Math.ceil(Math.sqrt(area/Math.PI));
};
var r = radius(21000);
var d = r*2;
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