The horizontal angles

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Question

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).

Options:

A . `(sin alpha_1)/(sin alpha_2) = (L_2 sin theta_1)/(L_1 sin theta_2) = K `

B . `alpha_t tan alpha_2 = 360^circ - ( theta_1 + theta_2 + beta) = phi`

C . `tan alpha_2 = (sin phi)/(K + cos phi)`

D . all the above.

Answer: Option D

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