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Which is the oldest type of welding?
When man started to melt and cast metal he would pour the molten metal into a mold, usually formed in the sand. If he wanted to join two or more of these "castings" he would place them close together and pour more molten metal where they touched. This would melt the edges of the two castings and upon cooling join them with weld. This is a basic welding process.
How many faces edges vertices does a dodecahedron have?
Faces- 20 Edges- 30 Vertices- 12
Who invented the welder?
Frederick M Bowers invented the first Welding Helmet on April 13, 1915. But I'm not sure where he lived or where the invention took place!! Please improve this answer if you do hear anything!! Ali x Maybe the question isn't about welding helmets but welding. If so, welding was first performed during the Bronze Age. Melting and casting metals (Copper, Brass, etc) and when 2 or more castings needed to be joined they were placed close together and molten Copper, Brass, Bronze was poured so that the puddle would melt the edges producing a "weld" joint. The term Welding means to melt the base material whether it is metal, glass, plastic or some other material.
When prim algorithm fail?
When there are directed edges in the graph, as it is impossible to move back from B to A when the edges are directed.
How many faces edges vertices does a octahedron have?
It has 8 faces, 6 Vertices, and 12 edges * * * * * That is one configuration. An octahedron can also be a heptagonal pyramid which has 8 faces, 8 vertices and 14 edges.
