Question

in the given figure,there are two concentric circles of radii 10cm and 5cm. find the area of shaded region. take pie =3.14

Answer 1

area of shaded region = area of smaller circle + area of sector of big circle - area of sector of small circle

=pi*r*r + 60°/360°* pi(R^2-r^2)

=3.14*5*5+1/6*3.14*(100-25)

=78.5+39.25

=117.75 cm^2