(There are no railways in Central African Republic, Chad, Niger)
South America & Central America
See also: Transportation by country, Lists_of_companies
... can be generalized to the law of cosines:
<math>c^2 = a^2 + b^2 - 2ab \cos(\gamma)</math>
which is valid for all triangles, even if γ is not a ...
Book Week Costumes
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