Quantitative Aptitude Mensuration Plane Figures

It is given that 4/5 of the perimeter of circular ring A is equal to the sum of the perimeter of another circular ring B and semicircular ring B, what is the ratio of their radii?

1

(π + 2) : 2π

2

(15π + 10) : 8π

3

(π + 2) : 4π

4

4π : (π + 2)

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