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Mathematics 17 Online
OpenStudy (anonymous):

Given a line l in some plane, how many coplanar (that is, in the same plane) lines are both parallel to l and a distance d from l?

OpenStudy (mathmate):

If it is at a distance d from I, these lines lie on a cylindrical surface. Any plane parallel to I will intersect with the cylindrical surface at two intersections, => 2 lines.

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