yes polygons are closed figures
yes, star shaped figures ARE polygons.
Polygons for example
All polygons
Polygons are closed plane shapes bounded by straight lines.
polygons are a subcategoryof two-dimensionalfigures
Polygons are flat shapes with many sides
Yes.
Many 3-d figures can have polygons for bases. If all ist faces are polygons then it is a polyhedron but it is possible to have 3-d figures with a polygonal base and non-polygonal faces.
Yes quadrilaterals are 4 sided closed figures or polygons
Polygons
Regular polygons