Answer:
length of cord comes out to be 14
Step-by-step explanation:
Given,
area of concentric circle = 49 π
area of concentric circle = π (r₁² - r₂² )
where r₁ = outer radius and
r₂ = inner radius
π (r₁² - r₂² ) = 49 π
r₁² - r₂² = 49......................(1)
from the figure you can see that
r₁² - r₂² = l²
l² = 49
l = 7
so length of cord = 2 l = 2×7 = 14
hence the length of cord comes out to be 14
