no
A face
cube There are a great many solid shapes that have only flat surfaces.
rectangle, cylinder
Plane Geometry (is about flat shapes like lines, circles and triangles ... shapes that can be drawn on a piece of paper) Solid Geometry (is about three dimensional objects like cubes and pyramids).
Polygons are flat shapes
Two-dimensional geometric shapes, or 2D shapes, are flat figures that have length and width but no depth, such as squares, circles, and triangles. In contrast, three-dimensional geometric shapes, or 3D shapes, have length, width, and depth, giving them volume; examples include cubes, spheres, and pyramids. The distinction lies in the dimensionality, with 2D shapes being surface-level and 3D shapes occupying space.
A face
Mondrian
Identify shapes of common objects. Identify faces, vertices, and edges of solid shapes; sort solid objects by faces, edges, and vertices. Relate solid shapes and plane shapes. Identify and count vertices and sides of shapes. Use shapes, such as pattern blocks, to make new shapes. Identify the movement of a shape as a slide, flip, or turn. Recognize and draw congruent figures
A sphere has a surface but no flat face.
Yes, plane figures are flat, not 3-dimensional shapes.
a net is what you get when you unfold a geometric shape into a 2-d flat surface
Polyhedron is a geometric solid in three dimensions with flat faces and straight edges.
The three main types of geometric solids are polyhedra, which are three-dimensional shapes with flat polygonal faces; curved solids, which include shapes like spheres and cylinders with curved surfaces; and composite solids, which are formed by combining multiple geometric solids. Each type has distinct properties and characteristics that define their structure and dimensions.
sphere
Well, honey, Cubes and Spheres are called solid figures because they have three dimensions: length, width, and height. Unlike those flat, two-dimensional shapes, these bad boys have depth, making them solid. So, next time you see a Cube or Sphere, just remember they ain't no flimsy paper cutouts - they're the real deal.
Plane figures are flat (2-dimensional) shapes.