Triangles in a Trapezoid

The diagonals of a trapezoid divide the interior region into four nonoverlapping triangles. How do the areas of the green triangles relate to each other (the triangles that share a side with the legs)? How do the area of the yellow triangles relate to each other (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.