9514 1404 393
Answer:
112π ≈ 351.9 square units
Explanation:
Assuming the smaller circle is wholly contained within the larger circle, the difference of their areas is ...
ΔA = (π·11²) -(π·3²) = π·(121 -9) = 112π ≈ 351.9 . . . square units
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The formula for the area of a circle is ...
A = πr²