Calculate the area of the shaded region in the figure given in cm2.
469.3
Area of outer sector
=140°360°×π×20 cm×20 cm
Area of inner sector
=140°360°×π×4 cm×4 cm
Area of shaded region = Outer sector - Inner sector
=140°π360°(400 cm2−16 cm2)
=718×227×384 cm2=469.3 cm2