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Math Help - The Earth Question (Latitude)

  1. #1
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    The Earth Question (Latitude)

    The circumference of a circle of latitude is two thirds of the circumference of the equator. What is the latitude?


    A diagram would be nice
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  2. #2
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    Equator: 2\pi\;r_{e}

    New Lattitude: 2\pi\;r_{new}\;=\;\frac{2}{3}\;2\pi\;r_{e}

    r_{new}\;=\;\frac{2}{3}r_{e}

    A right triangle: \cos(lattitude)\;=\;\frac{r_{new}}{r_{e}}
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