OACB is a quadrant of a circle with centre O and radius 7 cm. If OD = 4cm, then find the area of shaded region. [3 MARKS]
OACB is a quadrant of a circle with centre O and radius 7 cm. It OD = 4cm, then find area of shaded region.
OACB is a quadrant of a circle with centre O and radius 7 cm. It OD = 4cm, then find area of shaded region (in cm2).