Advantages of skewed slots in the rotor of a squirrel cage motor?

It is a usual practice to use the rotor of a squirrel cage motor with skewed slots i.e. slots that are not parallel to the shaft axis. This arrangement offers the following advantages :

(i) It reduces motor noise and vibration.
(ii) It increases the starting torque and reduces the starting current.
(iii) It increases the rotor resistance due Ix increased length of rotor bars.