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, ...

We’ve all learned “parallel lines never intersect” in high school geometry. But what your teachers failed to explain is that “parallel lines never intersect” is only true in Euclidean geometry, which ...

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 ...