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A cargo ship is 4.2 miles from a lighthouse, and a fishing boat is 5.0 miles from the lighthouse, as shown below. The angle between the straight lines from the lighthouse to the 2 vessels is 5 °. The approximate distance, in miles, from the cargo ship to the fishing boat is given by which of the following expressions?

26 Jun

A cargo ship is 4.2 miles from a lighthouse, and a fishing boat is 5.0 miles from the lighthouse, as shown below. The angle between the straight lines from the lighthouse to the 2 vessels is 5 °. The approximate distance, in miles, from the cargo ship to the fishing boat is given by which of the following expressions?

(Note: The law of cosines states that for any triangle with vertices A, B, and C and the sides opposite those
vertices with lengths a, b, and c, respectively, c^2 = a^2 + b^2 – 2ab cos C.)

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