nothing really.
a 3 D figure must have 3 dimensions only:Height,Length,and Breadth.
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Isometric drawings, 3-D representations, are drawn on an angle to the parallel to show how the finished product should look. All dimensions should be the same as if drawn flat (2 dimensional).
A "square" is a flat shape, depicted on a piece of paper or other flat surface. Since it has only two dimensions, it has no volume. In other words, a square can't hold any water.
there are three major types vanes are used for a centrifugal pumps those are 1.forward curved vanes 2.backward curved vanes 3.flat vanes
A flat roof would be better than a sloped roof because a flat roof is significantly cheaper to build. Another consideration of a flat roof would be that it is a more modern design and would fit a more contemporary home.
* a flat escalator * A moving walkway * people mover * mobile sidewalk * Pedestrian mover * Esca-walk