Lorena T.
asked • 04/02/22Out for a walk in Chicago, Brian measures the angle of elevation to the distant Willis
Tower, and gets 3.6 degrees. After walking one km directly toward the building, Brain finds
that the angle of elevation has increased to 4.2 degrees.
Use this information to calculate the height of the Willis Tower, and how far Brian is from it now.
Draw a figure!
In the triangle further from the building, the angles are 3.6, 175.8 and .6 degrees.
Use the law of sines to compute the distance from the Brian's first point to the top of the tower.
Then the height of the tower is that distance times the tan of 3.6 degrees.
Paul M.
04/02/22
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Jennifer M.
5.0 (1,625)
Ingrid M.
5.0 (1,170)
Elaine S.
4.9 (685)
Lorena T.
Not allowed to use law of sines. Used substitution with tan 3.6=h/1+x and tan 4.2=h/x and found distance is 6 km. Is this correct?04/02/22