Question

if the circumference is of two concentric circles forming the ring, are 88 centimetre and 66 CM respectively find the width of the Ring

Answer 1

Let the width be d cm
Let radius of bigger circle be R cm and of the the inner circle be r cm.
R-r=d
2πR-2πr=88-66
2π(R-r)=22
22/7*d=22
d=7 cm

Answer 2

circumference of outer circle =88cm. 2πr=88cm
r=88×7÷2×22=14cm
circumference of inner circle=66cm
2πr=66cm
r=66×7÷2×22=10.5cm