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All congruent figures are similar figures, and have identical sizes.
3dimentional figures are solid figures.
The CRT display becomes an electronic graph of two instantaneous voltages. The display may be a direct comparision of two voltages such as during phase measurement, or frequency measurement with Lissajous waveforms.
Congruent figures are figures that have the same size and shape.
For example, figures like C and N are open figures, and figures like O and D are closed.