Question

The circumference of two concentric circles forming a ring are 88cm and 66cm respectively. The width of the ring is​

Answer 1

Step-by-step explanation:

2πr1 = 88

2×22/7×r1 =88

r1 = 88×7/22×2

r1 = 14cm

and 2πR = 66

2×22/7×R =66

R= 66×7/22×2

R= 10.5cm

width = area of ring

= πr²-πR²

= π[r²-R²]

=22/7[(14)²-(10.5)²]

=22/7 (196-110.25)

= 22/7(85.75)

=269.5 cm²

Answer 2

Refer to the above picture.