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From a ship, the angle of elevation of a point a at the top of a cliff is 21. after the ship has sailed 2,500 feet directly toward the foot of the cliff, the angle of elevation of a is 47. find the height of the cliff. (round to the nearest whole number.) hint: find the interior angles of each triangle first. 1,495 ft. 2,044 ft. 4,171 ft.