Triangles in a Trapezoid

The diagonals of a trapezoid divide the interior region into four nonoverlapping triangles. What is the relationship between the areas of the green triangles (the triangles that share a side with the legs)? What is the relationship between the areas of the yellow triangles (the triangles that share a side with the bases)? You may need to make additional measurements other than the area of the triangles. Explain your solutions.