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A really arcaic calculator for pi, that takes ages to get a little precision.

var ex431 = function(tries){
    var inc=0, outc=0, x, y;
    
    while(tries>0){
        x =  Math.random();
        y =  Math.random();
        
        if (x*x + y*y <= 1) inc++;
        else outc++;
        tries--;
    }
    return inc/(inc+outc);
}