What's the answer and explain

The side length of the wall is C. 9 ft.

Step-by-step explanation:

Step 1:

The area of the square wall Paula covered with wallpaper was 87.5 ft².

The area of a square is determined by squaring the side length.

Here we know the area of the square and need to determine the side length of the wall.

The area of a square where a is the side length.

Step 2:

The area of the wall =

By substituting the known values, we get

ft.

So the side length of the wall is C. 9 ft.

care to share were the trapezoid shown is ?