
Jon S. answered 02/11/21
Patient and Knowledgeable Math and English Tutor
cos(31) = adjacent/hypotenuse
cos(31) = 400/bridge length
bridge length = 400/cos(31)
Brian A.
asked 02/11/21A surveyor is standing 400 m from the beginning of a proposed bridge over a river. He measures an angle of 31° to the bridge site on the other end of the river. What is the length of the proposed bridge
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400
Jon S. answered 02/11/21
Patient and Knowledgeable Math and English Tutor
cos(31) = adjacent/hypotenuse
cos(31) = 400/bridge length
bridge length = 400/cos(31)
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