Help please I'm tired and i forget how to do this :(

121 ft^2

Step-by-step explanation:

I'm going to tell you my method, which differs through teachers (I'm a student lol).

I find the total area and then subtract the white space.

13 * 11 = 143 gives you the area including the white space.

You can subtract the 9 from 13 to find the width of the white space, and we know the length is 11 since is the same on the other side.

13 - 9 = 4

4 * 11 = 44

This is a triangle, so you divide the rectangle calculated by 2.

44/2 = 22.

The area stated earlier was 143, and you subtract the 22.

143 - 22 = 121