How do you caluclate the length of the 40 degree paralel of latitude, to the nearest 10 km?
- Anonymous1 decade agoFavorite Answer
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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