If a ship sailed due south from iceland to antarctica, it would sail through an angel of rotation of about 140° around earths center. find this measure in radians. then , using 3960 miles for earth radius, find how far the ship would travel.

If a ship sails from Iceland to Antarctica, it would sail through an angle of 140°, this is equivalent of:
140/180π radians
=7/9π rad

Given that the radius if the earth is 3960 miles, the distance that the ship traveled will be:
C=θ/360πd
d=(2r)=2*3960=7920 miles
θ=140
hence
C=140/360×π×7960
C=3080π miles
hence the distance the ship covered was 3080π miles

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