Calculate the area of the shaded section, when the area of the smaller circle is [[$ 40.0% $]] of the area of the larger circle. (Source: Entrance examination for technical training, 1994)
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Mark the area of the shaded area with [[$ A $]].
Mark the area of the smaller circle with [[$ B $]].
Mark the area of the larger circle with [[$ C $]].



Answer: The area of the shaded section is approximately cm[[$ ^2 $]]