Question

find the area of shaded region

Answer 1

Angle of sector= 30°

OB=OA =21cm

OD=OC=7cm

Area of shaded region= 30°/360 πOB²- 30/360πOD²= 30/360π°(OB²-OD²)

1/12π(OB+OD)(OB-OD)

1/12π(21+7)(21-7)

1/12π(28)(14)

1/6π(14)(14)

1/3π(7)(14)

=1/3π(98)

102.66cm²(Approx)

ANS:102.66cm²

Answer 2

the answer is completed