figures what are 3D
"Quadrilateral" means "four sides" and normally would be applied to plane, ie 2D, figures. Four-sided 3D figures are normally referred to as tetrahedrons, (properly tetrahedra) eg a three sided pyramid and its base.
No, you are thinking about 3d figures
visualizing solid shapes means 3 dimensional or 3D figures
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.
3D means that they have three dimensions, which are height, width and depth. 3D figures are solid shapes such as cubes and spheres, rather than their 2D equivalents which would be squares and circles.
3D Triangle figures...
They have sides but 3D figures have edges
Use the coordinates of the vertices.
1D figures are important in the real world because if we did not have 1D figures, the we wouldn't be able to make 2D and 3D figures.
Squares are 2D figures and cubes are 3D figures Also squares are the faces of a cube
A triangular pyramid is a pyramid with a triangular base; all pyramids are by definition three-dimensional figures, so a triangular pyramid is indeed 3D.