No, you could define a plane as comprising only two lines.
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No, it is not. In affine geometry you could define a plane as having only two lines: it would be a very boring plane but that is besides the point.
I'm not really sure. I think it is intersecting lines.
2 lines, I believe.
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true
The contrapositive to the statement, "if two lines intersect to form right angles, then they are perpendicular," is "if two lines are not perpendicular, then they do not form right angles."