Question

A nautical mile equals the length of arc subtended by a central angle of 1 minute on a great circle on the surface of Earth. If the radius of Earth is taken as 3960 miles, express 1 nautical mile in terms of ordinary, or statute, miles.

Answer 1

Around the earth is 360*60 = 21600 minutes of arc or nautical miles.

2 pi (3960) = 24881 landlubber miles around the earth

24881/(360*60) = 1.152 landlubber miles/ nautical mile