Question

the circumference of two concentric circles are 121cm and 154cm calculate the difference between their radii​

Answer 1

Answer:

r1=121×7/22×2

r1=77/4

r2=154×7/22×2

r2=49,/2

r2_r1=49/2_77/4

98_77/4

21/4cm

Answer 2

Answer:

Step-by-step explanation:

2πr₁ = 121 = 2 * 22/7 * r₁

121 * 7 / 2 * 22 = 19.25 = r₁

2πr₂ = 154 = 2 * 22/7 * r₂

154 * 7 / 2 * 22 = 24.5 = r₂

difference between their radii = 24.5 - 19.25 = 5.25//