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All congruent figures are similar figures, and have identical sizes.
In 10.00, the first significant figure is the "1", and the last significant figure is the last "0", because zeroes to the right of the decimal are significant. The two central zeroes are also significant because they are between significant figures, so 10.00 has 4 significant figures.
3dimentional figures are solid figures.
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.