Question

if the circumference of two concentric circles forming a ring are 88 cm and 66 cm, then find the width of the ring.

Answer 1

2ΠR=88 cm & 2Πr=66cm
2*22/7*R=88
44/7*R=88
R=88*7/44
R=2*7=14cm
Similarly , 2Πr=66
2*22/7*r=66
44/7*r=66
r=66*7/44
r=6*7/4
r=42/4 cm
Width of the ring = R-r
=14-42/4
=14-10.5
=3.5 cm.

Answer 2

Find the radius of the outer ring:

Circumference = 2πr

2πr = 88

r = 88 ÷ 2π

r = 14 cm

Find the radius of the inner ring:

Circumference = 2πr

2πr = 66

r = 66 ÷ 2π

r = 10.5 cm

Find the width of the ring:

Width = 14 - 10.5 = 3.5 cm

Answer: The width of the ring is 3.5 cm