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From a hand glider approaching a 6000 foot clearing the angles of depression of the opposite ends of the field measure 24 degrees and 30 degrees. how far is the hang glider from the nearer end of the field?

Math - drwls, Saturday, May 17, 2008 at 11:40pm
The third angle of the triangle formed by the hang glider and the two edges of the field is 180 - 24 - 30 = 126 degrees. This is the angle subtended by the field. The side opposite that subtended angle has a length of 6000 ft (the clearing length). Use the law of sines for the other two triangle sides. The side opposite the 24 dsegree corner will be the distance to the nearest edge.

Tareena:
Suppose
A=30
B=24
C=126
sin A= sin30 x 6000/sin 126=3708
sin B= sin24 x 6000/sin 126=6148

  • Math -

    My mistake. The closest edge has the largest angle of depression.

    Your method is correct, but you are solving for sides a and b, not the angles A and B .
    a = 3708 m is the answer.

  • Math -

    I think the angles of the triangle are:
    24
    180-30 = 150
    180 - 24 - 150 = 30 - 24 = 6
    so I think
    sin 24 / x = sin 6/6000

    x = 6000 (sin 24 /sin 6)
    = 6000 (.407/.105) = 23,257

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