Trigonometry

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Karla is riding vertically in a hot air balloon, directly over a point P on the ground. Karla spots a parked car on the ground at an angle of depression of 30o. The balloon rises 50 meters. Now the angle of depression to the car is 35°. How far is the car from point P?

  • Trigonometry -

    We form 2 similar rt. triangles:

    Triangle #1.
    X = Hor. side = dist. from P to the car.
    Yi = Ver. side.
    A = 30o.

    Triangle #2.
    X = Hor. side = Dist. from P to the car.
    Y2 = Y1+50 = Ver. side.
    A = 35o.

    Use aw of Sines.
    sin30/Y1 = sin35/(Y1+50).
    Cross multiply:
    (Y1+50)sin30 = Y1*sin35
    Y1/2+25 = 0.574Y1
    Multiply both sides by 2:
    Y1+50 = 1.148Y1
    1.148Y1-Y1 = 50
    0.148Y1 = 50
    Y1 = 337.8 m.

    tan30 = Y1/X = 337.8/X
    X = 337.8/tan30 = 585 m.

  • Trigonometry -

    714 feet away

  • Trigonometry -

    I gave up.

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