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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.
India is founder of zero
Congruent figures are figures that have the same size and shape.