An ellipse is described by using an endless string which is passed over two pins.If the axes are 6 cm and 4 cm,the length of the string and distance between the pins are ____________

Question

$\begin{array}{1 1}6+\sqrt 5,\sqrt 5\\6-\sqrt 5,\sqrt 5\\6+2\sqrt 5,2\sqrt 5\\6-2\sqrt 5,2\sqrt 5\end{array} $