Area of the smaller part of a circle cut off by a vertical line

1. A.
   $\frac{a^2}{4}\left(\frac{\pi}{2}-1\right)$
2. B.
   $a^2\left(\frac{\pi}{4}-1\right)$
3. C.
   $\frac{a^2}{2}\left(\frac{\pi}{2}-1\right)$
4. D.
   $\frac{a^2}{4}\left(\frac{\pi}{4}-1\right)$

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1. A.
   $\frac{4\pi}{3} - \sqrt{3}$
2. B.
   $\frac{8\pi}{3} - \sqrt{3}$
3. C.
   $\frac{4\pi}{3} + \sqrt{3}$
4. D.
   $\frac{5\pi}{3} + \sqrt{3}$

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1. A.
   $\dfrac{4\pi}{3} - \sqrt{3}$
2. B.
   $\dfrac{\pi}{3} - \sqrt{3}$
3. C.
   $\dfrac{4\pi}{3} + \sqrt{3}$
4. D.
   $\dfrac{\pi}{3} + \sqrt{3}$

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