Earth parallel

Earth's radius is 6370 km long. Calculate the length parallel of latitude 50°.

Correct result:

l =  25727 km


N=50 rad=50 π180 =50 3.1415926180 =0.87266=5π/18 R=6370 km r=R cos(N)=6370 cos(0.8727)4094.5571 km l=2π r=2 3.1416 4094.5571=25727 km

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