5. Trigonometry and Area
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The diameter is the distance from one side of the circle's circumference, through the center of the circle, to the opposite side.
3.2m
Let's recall the definitions of radius and diameter.
We can see in the diagram that the radius is 1.6m. According to the definitions, the diameter is twice the radius. Therefore, the diameter is 1.6* 2=3.2m.