This problem is about areas of shapes.
In this case, we have a flag and its pole. The flag is a triangle and the pole is a rectangle, and we want to know the area of the flag and the pole together.
First of all, the areas can add (sum), so the total area is the area of the flag plus the area of the pole.
Let's start with the pole:
Now, with the flag:
Finally, the total area is the sum of the two areas: