7. Four mark example problems I

The radius of a sector is \(21 \ cm\) and its central angle is \(120^{\circ}\). Find (i) the length of the arc (ii)area of the sector (iii)perimeter of the sector. \(\left(\pi = \frac{22}{7}\right)\)

 

 

Answer:

 

(i) Length of the arc \(=\)  \(cm\)

 

(ii) Area of the sector \(=\)  \(sq. \ cm\)

 

(iii) Perimeter of the sector \(=\)  \(cm\)