Two concentric circles are centred at O. The area of the shaded region if outer and inner radii are 14 cm and 7 cm respectively, is
A. 462 cm2
B. 154 cm2
C. 231 cm2
D. 308 cm2
Answer:A
Two concentric circles are centred at O. The area of the shaded region if outer and inner radii are 14 cm and 7 cm respectively, is
A. 462 cm2 B. 154 cm2 C. 231 cm2 D. 308 cm2