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computed tomography
you can coordinate parallel because parallel lines never touch or cross
Folding a sheet into thirds is the process used for placing letters into envelopes. Bring the bottom of the sheet up toward the center, but do not crease. At the same time, bring down the top of the sheet over the bottom. As the sections roll past each other, there is one position where they form a stack of three equal areas. You can crease at this point to make the shortest possible folded sheet.
In general, the associative property cannot be used for this purpose. The volume of a prism is the area of cross section multiplied by the length, and except in the case of a rectangular prism, there is no scope for using the associative property.
3D printing technology has advanced to a level where it is just as easy to make 3D prints as one would make laser or inkjet prints at home. Even the prices of 3D printers have fallen to levels that are surprisingly affordable. Materials such as polymer resin or filaments of polymers, are so affordable priced they will make you consider buying a cheap 3d printing machine and get started printing you. iannone3d.com