Today i am solving the ncert class 10 chapter areas related to circles of exercise 12.3 question no. 12 . Please give me the best and easiest solution of this question ,find the simplest solution of this question i want to solve this tricky question easily. In Fig. 12.30, OACB is a quadrant of a circle with centre O and radius 3.5 cm. If OD = 2 cm, find the area of the (i) quadrant OACB, (ii) shaded region.