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How was a freshwater supply transported from the Tiber River to the city of Rome?
by underground channels
by trade routes
by armed forces
by stone roads

Freshwater supply was transported by trade routes.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.