question_answer

Given three circles are concentric whose common centre is O. if diameter RS = 84 cm and diameters PQ = \[\frac{1}{2}\] RS; AB = \[\frac{1}{4}\]RS; then find the area of shaded portion (use\[\pi \]=\[\frac{22}{7}\]).

A)  \[1168.5\,\,c{{m}^{2}}\]                     

B)  \[1039.5\,\,c{{m}^{2}}\]

C)  \[946.5\,\,c{{m}^{2}}\]                      

D)  \[1064.5\,\,c{{m}^{2}}\]

E)  None of these