Multiple choice

The shaded portion of the figure, given along side,shows two concentric circles. If the circumference of the two circles be $396 :cm$ and $374: cm$, find the area of the shaded portion.

  1. $1347.5 \: cm^{2}$
  2. $1047.5 \: cm^{2}$
  3. $2347.5 \: cm^{2}$
  4. $1247.5 \: cm^{2}$
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