The uros people have adapted to the geography of lake titicaca, much like the incas, by making islands out of (1 point)
rock.
sand.
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The Uros people have adapted to the geography of Lake Titicaca, much like the Incas, by making islands out of reeds. The correct option among all the options that are given in the question is the fourth or the last option. The Uros people had created forty two self made floating islands out of dried bundles of dried totora weeds.  

Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160

The answer is a and hi how are you doing