function GeoCalc(){
var Surface;
side = eval(document.exagone.side.value);

if(side > 0){

	Surface = FormatNumber(2.60 * Math.pow(side,2));
	
	if(Surface >= 100)
		resultSurface = "&#928; = 3.141592653589793<br />Surface<br />" + Surface + "  cm<sup>2</sup><br />" + FormatNumber(Surface/10000) + "  m<sup>2</sup><br />";
	else
		resultSurface = "&#928; = 3.141592653589793<br />Surface<br />" + Surface + "  cm<sup>2</sup><br />";
	
	document.getElementById("surface").innerHTML = resultSurface;
}

}