Earth's circumference

Calculate the Earth's circumference of the parallel 48 degrees and 10 minutes.

Correct result:

x =  26728.1018 km

Solution:

R=6378 km A=48+10/60=289648.1667  cosA=r/R  r=R cosA=R cos48.1666666667 =6378 cos48.1666666667 =6378 0.666966=4253.90952  x=2π r=2 3.1416 4253.9095=26728.1018 km



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