Question

The radius 'R' of outer circle is 21cm and
the radius 'r' of the inner
circle is 7cm. find
(i) The area of the outer circle
(ii) The area of the inner circle
(iii) The area of the shaded region
ER​

Answer 1

Step-by-step explanation:

R = 21 cm

r = 7cm

i) Area of the outer circle = π R²

➡️Area of the inner circle = 22/7 × 21 ×21

➡️ Area of the outer circle = 1386 cm²

ii) Area of the inner circle =22/7 × 7 ×7

➡️ Area of the inner circle = 154 cm²

Answer 2

Step-by-step explanation:

(iii) The area of the shaded region

ER = area of outer circle - area of inner circle

= 1386 - 154

= 1232 cm²