The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ_{1} and θ_{2}. The distances AB = L_{1} and BC = L_{2}. For calculating the angle α_{2} at C between the boat and station B is obtained by using the following formula: where (β is horizontal angle between A and C at B).

[A].

[B].

α_{t} tan α_{2} = 360° - (θ_{1} + θ_{2} + β) = φ

[C].

[D].

all the above.

Answer: Option D

Explanation:

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