How do you caluclate the length of the 40 degree paralel of latitude, to the nearest 10 km?

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  • Anonymous
    1 decade ago
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    If r is the equatorial radius of earth, the radius of the 40 deg. parallel of latitude is:

    r cos(40 deg).

    Its circumference is 2pi r cos(40).

    Using r = 6,378.137 km (Wikipedia) gives:

    2 pi 6378.137 cos(40)

    = 30699.24 km

    = 30700 km to nearest 10km.

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