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The area of the shaded region in the following figure (all the arcs are circular) is

  1. $\pi$
  2. $2 \pi$
  3. $3 \pi$
  4. $\frac{9}{8} \pi$
in Numerical Ability by Boss (17.5k points)
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1 Answer

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Correct Answer - Option (B)

It's like semicircle of radius 1 unit is cut from the semicircle of radius 2 units and joined upside down to the semicircle of 2 units. So, the shaded area will be area of the semicircle with 2 units. 

Hence, Shaded Area   $ = \frac{1}{2}\cdot\pi \cdot (2^2) = 2 \pi$



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