Area of a quarter circle or semicircle from y = sqrt(a^2 - x^2)

1. A.
   $\pi$
2. B.
   $\frac{\pi}{2}$
3. C.
   $\frac{\pi}{3}$
4. D.
   $\frac{\pi}{4}$

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1. A.
   $49\pi$ sq. units
2. B.
   $\frac{49\pi}{2}$ sq. units
3. C.
   $\frac{49\pi}{4}$ sq. units
4. D.
   $98\pi$ sq. units

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1. A.
   $\dfrac{3\pi}{4}$
2. B.
   $\dfrac{9\pi}{4}$
3. C.
   $\dfrac{7\pi}{4}$
4. D.
   $\dfrac{5\pi}{4}$

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1. A.
   $\dfrac{\pi}{2}$
2. B.
   $\dfrac{\pi^2}{2}$
3. C.
   $\pi$
4. D.
   $\dfrac{2\pi}{3}$

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1. A.
   $16\pi$
2. B.
   $12\pi$
3. C.
   $8\pi$
4. D.
   $4\pi$

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