random6.sqf

private _pointA = _origin getPos [_radius, 0];
private _pointB = _origin getPos [_radius, 72];
private _pointC = _origin getPos [_radius, 144];
private _pointD = _origin getPos [_radius, 216];
private _pointE = _origin getPos [_radius, 288];

private _vecAC = _pointC vectorDiff _pointA;
private _vecEB = _pointB vectorDiff _pointE;

private _r =
    (_vecEB#0 * _pointA#1 + _vecEB#1 * _pointE#0 - _vecEB#0 * _pointE#1 - _vecEB#1 * _pointA#0) /
    (_vecEB#1 * _vecAC#0 - _vecEB#0 * _vecAC#1);

private _edgeAB = _pointA vectorAdd (_vecAC vectorMultiply _r);

private _edgeDistance = _edgeAB distance2D _origin;
private _edgeAngle = _origin getDir _edgeAB;

private _edgeBC = _origin getPos [_edgeDistance, _edgeAngle + 72];
private _edgeCD = _origin getPos [_edgeDistance, _edgeAngle + 144];
private _edgeDE = _origin getPos [_edgeDistance, _edgeAngle + 216];
private _edgeEA = _origin getPos [_edgeDistance, _edgeAngle + 288];

private "_position";

while {
    _position = _origin getPos [_radius * sqrt random 1, random 360];
    !(_position inPolygon [
        _pointA, _edgeAB,
        _pointB, _edgeBC,
        _pointC, _edgeCD,
        _pointD, _edgeDE,
        _pointE, _edgeEA
    ]);
} do {};

_position