Question

Find the circumference of the inner and the outer circles, shown in the adjoining figure? (Take π = 3.14)

Answer 1

Circumference of the outer circle = 2πr sq.units
= 2 × 3.14 × 19
= 119.32 m
radius of the inner circle = 19 – 10 = 9 cm.
Circumference of the inner circle = 2πr sq.units
= 2 × 3.14 × 9
= 56.52 cm