Graphically I am given 3 information, as you have already noticed.
I am starting to wonder if they are missing one piece of information or is it that I am just lost.
Imagine (in your head) that the figure is stretchy. Picture sliding the measured portion of the base to the right. Do you "see" that the area becomes larger without any of the unlabelled information changing?
This shows that the posted information is not sufficient, of itself, to enable you to determine the area of the left-hand triangle or of the entire triangle. It is sufficient only to find the area of the right-hand triangle.