So AE=ED= 1/2AD=3.

Because in the parallelogram ABCD

So DC=AB=65438+ 00 BC = 6 AD.

If triangle CBF and triangle CDE are similar

Then CB/CD=BF/DE\

That is 6/ 10=BF/3.

So BF= 1.8.

If the proportions of the edges are not fixed, there is a second answer.