What is the distance through which the cutter has to move before the full depth of cut is acquired in milling?
(a) $\sqrt{d\left ( D-d \right )}$
(b) $\sqrt{D\left ( D-d \right )}$
(c) $\sqrt{\left ( D-d \right )d/2}$
(d)$\sqrt{\left D( D-d \right )/2}$