2 triangular gardens with isosceles triangles 6,6,2 and 8,8,3
1) The way to tackle this question is to think of how many sides each figure has.
A rectangle: 4 sides
A triangle: 3
2) Since Wendell bought six pieces of wood, He can set two triangles. But note that a triangle has to fulfill an inequality, so:

3) Thus, Wendell can use those six pieces of wood to make 2 triangular gardens with isosceles triangles 6,6,2 and 8,8, 3