Stars that populate the universe are not plane figures. They are oblate spheres.
If, by a star, you mean a many-pointed flat figure then yes, it is.
yes, a square can only exist on a plane in euclidean geometry.
In geometry, a triangle is always found in a prism.
No because in Geometry, a plane goes on infinitely. No because in Geometry, a plane goes on infinitely.
Two dimensional geometry is called "plane geometry" meaning that it occurs on a single surface or plane. The objects used in plane geometry are called plane figures.
An example is the Cartesian plane where coordinated geometry is plotted
The intersection of a plane with a solid figure is the set of points where the plane cuts through the solid. This intersection can take various forms depending on the orientation and position of the plane relative to the solid; it can be a point, a line, or a two-dimensional shape (such as a circle or polygon). The specific nature of the intersection is determined by the geometry of both the plane and the solid figure involved.
A two-dimensional figure, also called a plane or planar figure, is a set of line segments or sides and curve segments or arcs, all lying in a single plane. The sides and arcs are called the edges of the figure. The edges are one-dimensional, but they lie in the plane, which is two-dimensional. The triangle, the pentagon, the hexagon and the circle are just a few plane figures. Prisms and pyramids, for instance, are three-dimension figures.
A transformation is moving or changing the shape of a figure on the Cartesian plane by a translation, by a reflection, by a rotation or by an enlargment
B Abrahamson has written: 'Notes on plane coordinate geometry' -- subject(s): Coordinates, Geometry, Plane, Plane Geometry
Roy David Gustafson has written: 'Elementary plane geometry' -- subject- s -: Geometry, Plane, Plane Geometry
Geometry that is not on a plane, like spherical geometry
Plane Geometry and Solid Geometry