A town X is on longitude 40 degree W and latitude 50 degree S . Another town Y is on the same latitude as town X but on longitude 30 degree E . F ind the : (a) Circumference of the circle of latitude 50 degree S , correct to the nearest 100 km .
(b) Distance between X and Y measured along their parallel of latitude to the nearest 10 km
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take a look at the post by Leo, 8 problems below this one.
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