A polygon.
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1. has at least 3 straight sides 2.closed figure 3. forgot the third one
It is a polygon that is a closed plane figure with 3 or more straight lines.
When it has 3 sides or more and when it is closed figure
What about the other angle(s). You need at least 3 sides and 3 angles to make a closed figure.
A polyhedran is a 3-dimentional figure that has sides that are polygons. A polygon is a 2-dimentional figure with straight sides, a closed side.