Lines – 2
Here is a 3 by 3 array of dots. Five connected line segments have been drawn in a path that goes through all nine points.

THE CHALLENGE
Find four connected line segments that create a path that goes through all nine points.

EXPLORATION
Play around with other grids and discover shortest paths that go through all the points.
Notes
THE CHALLENGE
The key to answering this puzzle, and the next one with a 3 by 3 grid, is to think outside the “box.” The temptation in these puzzles is to think that the world of the puzzle is contained within the grid of points.
Here is the solution:

EXPLORATION
These are fun geometry puzzles and I am not aware of a general strategy of path creation that is associated with them.