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-B-αt tan α2 = 360° (θ1 + θ2 + β) = φC-D-all the above.-D-all the above.

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The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively &theta;1 and &theta;2. The distances AB = L1 and BC = L2. For calculating the angle &alpha;2 at C between the boat and station B is obtained by using the following formula: where (&beta; is horizontal angle between A and C at B).-A-B-&alpha;t tan &alpha;2 = 360&deg; (&theta;1 + &theta;2 + &beta;) = &phi;C-D-all the above.-D-all the above.

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The correct option is  D all the above. No answer description is available.

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