question_answer

Two circles are concentric whose common centre is O. Daimeter of outer circle is 42 cm. if the area of outer circle including inner circle is \[2618\,\,c{{m}^{2}}\]and area of shaded ring is \[1232\,\,c{{m}^{2}}\], then find the diameter of the inner circle.

A)  14 cm

B)  22 cm

C)  18cm              

D)  12cm

E)  None of these