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1 September, 12:09

A woman standing on a hill sees a flagpole that she knows is 30 ft tall. the angle of depression to the bottom of the pole is 14°, and the angle of elevation to the top of the pole is 18°. find her distance x from the pole. (round your answer to one decimal place.)

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  1. 1 September, 12:18
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    Draw a diagram:

    from the top of the hill draw a line 18° above the horizontal to the top of the 30 ft pole.

    From the top of the hill we draw a line 14° below horizontal to the bottom of the 30 ft pole.

    We now have 2 right triangles sharing a common horizontal line, x, to the pole.

    Let y=part of pole above horizontal line

    30-y=part of pole below horizontal line.

    We shall have the following equations:

    y/x=tan 18

    30-y/x=tan14

    x=y/tan 18

    x = (30-y) / tan 14

    y/tan 18 = (30-y) / tan 14

    y tan 14=tan 18 (30-y)

    ytan 14=30tan 18-ytan18

    y tan 14+y tan 18=30tan 18

    y (tan 14+tan 18) = 30*tan 18

    y = (30*tan 18) / (tan 14+tan 18)

    x=y/tan 18=30 / (tan 14+tan10) = 52.2423 ft

    thus her distance x from the pole=52.2 ft
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