Cosine(38) = Cos(38) = 0.788010753 ( per calculator) or 0.7880 (per Castle's Four Figure Tables).
The cosine of 90 degrees is zero.
The cosine of 8 degrees is 0.99026806874157031508377486734485
Cosine is 0.766
The cosine of 24 degrees is 0.913
cosine(59 degrees) = 0.51504 (rounded)
Find the cosine of 38 degrees and then find its reciprocal.
That would be the equatorial circumference times the cosine of 38 degrees. I get 19,605 miles (31,552 km) .
The cosine of 90 degrees is zero.
The cosine of 8 degrees is 0.99026806874157031508377486734485
38.00
Cosine is 0.995
Cosine is 0.766
The cosine of 60 degrees is 0.5
The cosine of 24 degrees is 0.913
Cosine(42 radians) = -0.399985 Cosine(42 degrees) = 0.743146
Cosine(84 radians) = -0.680023 Cosine(84 degrees) = 0.104528
cosine(59 degrees) = 0.51504 (rounded)