The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ1 and θ2. The distances AB = L1 and BC = L2. For calculating the angle α2 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).

Question

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NA

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[A].

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αt tan α2 = 360° - (θ1 + θ2 + β) = φ

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[C].

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all the above.

1.	The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ1 and θ2. The distances AB = L1 and BC = L2. For calculating the angle α2 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.	[A].
B.	αt tan α2 = 360° - (θ1 + θ2 + β) = φ
C.	[C].
D.	all the above.
Answer» E.

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