\b;Instruction \c;flatground\n; Syntax: \s;\c;flatground ( center, rmax );\n; Calculates the maximal radius of a flat zone on which a building ca be built. \t;center: \c;\l;point\u cbot\point;\n; Center of the circlular zone. \t;rmax: \c;\l;float\u cbot\float;\n; Maximal radius. \t;Return value: \c;\l;float\u cbot\float;\n; Radius of the flat zone (always between 0 and rmax). \t;See also \l;Programming\u cbot;, \l;types\u cbot\type; and \l;categories\u cbot\category;.