It is the intersection of two planes at the spine of the paper -- two flat regions represented by the two pages of the newspaper. Each is a separate plane, and they cannot be coplanar since there is an angle between them. If you lay the paper out flat, they become a single plane.
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No because in Geometry, a plane goes on infinitely. No because in Geometry, a plane goes on infinitely.
Geometry that is not on a plane, like spherical geometry
Plane Geometry and Solid Geometry
one is plane and one is solid
solid geometry deals with 3 dimensional figures while plane geometry deals with 2 dimensional.