Ken's POTW
Points and Lines
These puzzles range from the annoyingly simple to a bit frustrating,
but I felt they should be grouped together.

Place 12 trees in 6 rows, with 4 in each row.

Place 10 trees in 5 rows, with 4 in each row.

Place 9 trees in 10 rows, with 3 in each row.

Place 4 trees in 6 rows, with 2 in each row.

Place 9 points in a 3x3 grid. Connect all of them with four
straight lines without lifting your pen.

Place 16 points in a 4x4 grid. Connect all of them with six
straight lines without lifting your pen and ending where
you began.
If possible, send small
pictures (ASCII, jpg, gif) of your solutions for me to use. Otherwise,
a text description will suffice. If you have related puzzles to add
to this list, please send them, and I'll add them to the solution page.
Source:
Many sources.
Solution
Mail to Ken