A tourist at the top of the Gateway Arch (height, 630
Chapter 8, Problem 74(choose chapter or problem)
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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