Parallel lines are indicated by arrows going in the same direction. Parallel lines are indicated by arrows going in the same direction. If there is more than one set of parallel lines in a diagram, ...

If you took Geometry in High School, you almost definitely learned it as a subject based on rules and axioms discovered by the ancient Greeks. The details of this subject, which I must admit was ...

The battle lines are being drawn in the Greek drama, and in increasingly-strident tones that will make retreat very difficult. This is one negotiating strategy: burn the bridges behind the army. Here ...