geometry - 7 Trees, 6 Rows, 3 Per Row?

Can you arrange 7 trees so that there are 6 rows of 3 trees? It is entirely possible.

Note: A tree can be part of more then one row, for example a if you arranged a 3x3 square (9 trees) the tree in the center is part of 4 rows.

Rows are usually horizontal but in this case they can be horizontal, vertical, or diagonal.

Answer

(Joel Rondeau's solution would look like this:

    1
   2 3
    4
 5  6  7

With lines: 125, 137, 146, 247, 345, 567. A more symmetric solution than mine)