A very old puzzle, #146 from American Agriculturist, April 1865:

How may twenty-four trees be planted in eighteen rows, with four trees in each row? A row consists of a number of trees in a straight line. The same tree can be part of multiple rows. The rows can intersect at any angle. Rows can’t contain more than 4 trees.

A very old puzzle, #146 from American Agriculturist, April 1865:

How may twenty-four trees be planted in exactly eighteen rows, with four trees in each row? A row consists of a number of trees in a straight line. The same tree can be part of multiple rows. The rows can intersect at any angle. Rows can’t contain more than 4 trees.

A very old puzzle, #146 from American Agriculturist, April 1865:

How may twenty-four trees be planted in eighteen rows, with four trees in each row?

A very old puzzle, #146 from American Agriculturist, April 1865:

How may twenty-four trees be planted in eighteen rows, with four trees in each row? A row consists of a number of trees in a straight line. The same tree can be part of multiple rows. The rows can intersect at any angle. Rows can’t contain more than 4 trees.

A very old puzzle:

How may twenty-four trees be planted in eighteen rows, with four trees in each row?

A very old puzzle, #146 from American Agriculturist, April 1865:

How may twenty-four trees be planted in eighteen rows, with four trees in each row?