More complicated polygons.
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Submarine cable is constructed in much the same way direct bury cable is made. The major differences involve "what" is done rather than "how" it is done. What is done is that a whole lot of extra armor and waterproof jacketing is added. Check out the information posted by our friends at Wikipedia by using the link. The pictures alone are worth the time.
Bridges built in the 1800s were typically constructed of wood or stone. Some bridges were also starting to be constructed of steel in the early 1800s.
It is a crystal, all of whose faces are polygons.
One factor that polygons have is the scale factor which is the ratio of the lengths of two corresponding sides of similar polygons. This would only pertain to two or more polygons of course. You could also look at a single polygon and find the GCF of the lengths of its sides. So for example if you have a 3,4,5 triangle, the GCF is 1. If you have a 6,8,10 triangle it is 2.
Titanic was built in Belfast, Ireland.