A tourist at the top of the Gateway Arch (height, 630 feet) in St. Louis, Missouri, observes
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A tourist at the top of the Gateway Arch (height, 630 feet) in St. Louis, Missouri, observes a boat moored on the Illinois side of the Mississippi River 2070 feet directly across from the Arch. She also observes a boat moored on the Missouri side directly across from the first boat (see diagram). Given that, B = cot-1 67/55 estimate the width of the Mississippi River at the St. Louis riverfront.
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630 ft Boat Boat MO IL - 2070 ft
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