This diagram shows a SQUARE picture frame which measures 12 cm by 12 cm. The smaller square represents the area where the picture (which is `x` by `x`) will fit.

Figure is not drawn to scale
Sunny wants to cover the white area, the mat, in fabric.
Write an expression that represents the area of fabric that Sunny will need.
    Area of fabric =  
If `x = 9` cm, how much fabric will Sunny need?
    Sunny will need `\text{cm}^2` of fabric.