Correct Answer: Option B

Explanation

area of larger circle = 100\(\pi\)

\(\pi r^2 = 100\pi\)

R² = 100

R = 10(Radius)

Area of smaller circle = \(49 \pi\)

\(\pi r^2 = 49\pi\)

r² = 49

r = 7(radius)

Since R = x + r

x = R - r

x = 10 - 7 = 3

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