0.002537 =~ 0.00254 (3 sig. fig.)
0.002537 =~ 0.003 (3 decimal places)
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Height, length, width.
12300000 or better still, 1.23*107
21,600 using only four significant figures is still 21,600.
There are 3 significant figures
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.