Uncover valuable information and solutions with IDNLearn.com's extensive Q&A platform. Discover the reliable solutions you need with help from our comprehensive and accurate Q&A platform.

By changing the basic assumption that given a line and a point not on the line, one and only one line may be drawn through the given point parallel to the given line, we obtain _______ geometries. In one of these geometries, called elliptic geometry, there are no ______ lines.