A polygon, but only if all the line segments are coplanar.
A Triangle :)
a closed, flat figure is a polygon. But it is only a polygon when it is not round.
A line is the only 1-dimensional figure, but only while it's a straight line. As soon as it turns or bends, it's then 2-dimensional.
If it is not straight, then it is not a line.
a semi-circle
A polygon must be a closed figure with only straight lines.
A plane figure cannot be bounded by only one straight line. If the shape is bounded by lines which are not straight or by several straight lines the answer will depend on exactly what these are.
yes it does. a polygon has to be a closed figure with a least three sides and it can only have straight sides--no curves
A polygon is a closed figure with only straight edges. A polygon has at least 3 sides.
A polygon, but only if all the line segments are coplanar.
It is a polygon, but only if it is all in one plane.
A polygon.
triangel
IF (and only if) the lines are al coplanar, then a polygon.
A Triangle :)
No, the "U" shape is not a polygon. Polygons are closed figures made up only of line segments. The "U" shape includes a curved section, and is usually not a closed figure.