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March 30, 2017

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angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 31°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two decimal places.)

  • trig - ,

    measured from the plane, the building subtends an angle of 9°

    the distance d from the top of the building to the plane is found by

    d/sin50° = 40/sin9°
    d = 195.87

    now, knowing d, the height h of the plane can be found:

    (h-40)/d = sin31°
    (h-40)/195.87 = sin31°
    h = 40 + 195.87 sin31°
    h = 140.88
    h =

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