If we set this up with 800 ft as the legs and 160 ft as the height, we can then solve for the angle using a trigonometric function.
Since we have the opposite dimension and the adjacent dimension, then we can use tangent to solve for the angle.
[tex] tan(theta)=\frac{opp}{adj} [/tex]
[tex] tan(theta)=\frac{160ft}{800ft} [/tex]
[tex] theta=tan^{-1}(0.2) [/tex]
[tex] theta=0.19739556 [/tex] - but this answer is in radians. So we need to convert to degrees:
[tex] Degrees=\frac{180}{\pi}*radians [/tex]
[tex] Degrees=\frac{180}{\pi} *0.19739556 [/tex]
[tex] Degrees=11.31 [/tex]
Therefore, the angle that the helicopter took off from is A) 11.
