The Total solution for NCERT class 6-12
Radius of the outer circle = 19 m∴Circumference of the outer circle = 2πr= 2 × 3.14 × 19 = 3.14 × 38 m= 119.32 mRadius of the inner circle= 19m – 10m = 9m∴Circumference = 2πr = 2 × 3.14 × 9= 56.52 mHere the required circumferences are 56.52 m and 119.32 m.