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Mathematics 7 Online
OpenStudy (anonymous):

A radar operator on a ship discovers a large sunken vessel lying parallel to the ocean surface, 150 m directly below the ship. The length of the vessel is a clue to which wreck has been found. The radar operator measures the angles of depression to the front and back of the sunken vessel to be 52° and 70°. How long, to the nearest tenth of a metre, is the sunken vessel?

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