OACB is a quadrant of a circle with centre O and radius 7 cm. It OD = 4cm, then find area of shaded region.
Area of quadrant OACB = 90360 π × 72 = 772
Area of shaded region = Area of quadrant OACB - area of ΔOAD
= 772 - 12 × 7 × 4
= 24.5 cm2
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).
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]