Talia is making a stained glass window. She arranges small, medium, and large squares of glass in the pattern shown below. The area of each small square is 16 square centimeters.
What is the side length of the window? Explain.

1. The side length of the window is equal to the length of ___ small squares.

2. The edge length of each small square is __ which equals __.

3. So, the side length of the window is __

(Simplify your answers)