Find a direction angle using cos^2 a + cos^2 b + cos^2 g = 1

1. A.
   $\frac{\pi}{4}$
2. B.
   $\frac{\pi}{2}$
3. C.
   $\frac{\pi}{3}$
4. D.
   $\frac{\pi}{6}$

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1. A.
   $135^\circ$
2. B.
   $150^\circ$
3. C.
   $165^\circ$
4. D.
   $180^\circ$

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1. A.
   $135^{\circ}$
2. B.
   $120^{\circ}$
3. C.
   $160^{\circ}$
4. D.
   $150^{\circ}$

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

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