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Ruled surfaces.

Question asked by Pet Peever on Aug 13, 2012
Latest reply on Aug 13, 2012 by Alin Vargatu



For me, a ruled surface contains a family of straight lines.

More accurately., each point of the surface is contained in a straight line, lying on the surface.

I learnt that, some years ago, and the wiki seems OK with the teacher learning me the concept


So, how those surfaces can be ruled ?