Hello!
The answer is:
The area of the shape is:


Why?
To solve the problem, we must consider that the shape is formed by two right triangles and a square, so, to calculate its area, we need to calculate the areas of the two triangles and square, and then, add them.
So, we are given the following information:
Smallest triangle:

Square:

Largest triangle:

Calculations
Smallest triangle:
We can calculate the area of a triangle using the following formula:

So, substituting, we have:

Square:
We can calculate the area of a square using the following formula:

So, substituting, we have:

Largest triangle:
We can calculate the area of a triangle using the following formula:

So, substituting, we have:

Now, calculating the area of the entire shape, we have:

Hence, the area of the shape is:


Have a nice day!