3D figures have three dimensions - length, breadth (width), and depth. Everything you can pick up is 3D. 2D objects only exist on paper, like squares etc. A square you can pick up in your hand is actually a cuboid. 3D objects can be shown on paper in diagrammatical terms by using perspective.
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There are two significant figures in 0.025.
That depends on how many significant figures you are talking about.If three significant figures then 700 is the largest that rounds to 700.If four significant figures are to be rounded to three significant figures then 700.4If five significant figures are to be rounded to three significant figures then 700.49If six significant figures are to be rounded to three significant figures then 700.499etc.
The Definition of Congruent Figures (which is a proof) says that if two figures have corresponding sides congruent and corresponding angles congruent, then the figures are to be congruent.
The significant figures in 0.000042500 are: 0.0000425. So, there are 8 significant figures.
There are four significant figures in .007001