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.
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No, you are thinking about 3d figures
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.
Edges or sides? There are 3D figures with one side and one edge.
They are flat surface figures like squares and circles. 3D figures have length, width, and height like cubes and spheres.