Given,
Radius of small quadrant, r = 2 cm
Radius of big quadrant, R = 3.5 cm
(i) Area of quadrant OACB = 1/4 πR2
= 1/4 (22/7)(3.5)2
= 269.5/28 = 9.625 cm2
(ii) Area of shaded region = Area of big quadrant – Area of small quadrant
= 1/4 π(R2 – r2)
= 1/4 (22/7)(3.52 – 22)
= 1/4 (22/7)(12.25 – 4)
= 1/4(22/7)(8.25)
= 6.482 cm2