An arc of a circle of radius \(21 \ cm \) subtends an angle of \(60^\circ\) at the centre. Find:
 
(i) the length of the arc 
 
(ii) the area of the minor segment of the circle made by the corresponding chord. 
 
Ans:
 
(i) \(cm\)
 
(ii) iiii \(cm^2\)