a semi-circle
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.
IF (and only if) the lines are al coplanar, then a polygon.
triangel
A polygon.
A closed three-dimensional figure formed by four or more polygons that intersect only at their edges is called a polyhedron. It contains flat faces, straight edges, and sharp corners or vertices.
A semicircle?
A polygon must be a closed figure with only straight lines.
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 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.
A polygon, but only if all the line segments are coplanar.
A polygon is a closed figure with only straight edges. A polygon has at least 3 sides.
It is a polygon, but only if it is all in one plane.
IF (and only if) the lines are al coplanar, then a polygon.
triangel
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.