--- In

Hyacinthos@yahoogroups.com, "xpolakis" <xpolakis@...> wrote:

> Let 1,2,3,4,5,6 be six lines.

>

> Let 1 // 2 not // 3 // 4 not // 5 // 6 not // 1

>

> How many homethic triangles are there with no common vertex?

Let 1,2,3,4,5,..., 2n (n > 2) be 2n lines no three passing through a

point.

Assume that each one line in the set is parallel to only one line

in the set. ( n dyads of parallel lines)

How many dyads of triangles are formed having no vertex in common?

And how many homothetic dyads of triangles?

APH