Question 12 (i) 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
Radius of the quadrant =3.5cm=72cm Area of quadrant = (πR2)4cm2 =(227×72×72)4cm2 =778cm2
Question 12 (ii) 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: (ii) shaded region.