Shari's class is making team pennants for an upcoming field day. They cut the pennants out of a large sheet of paper in the pattern shown below.
The area of the whole pattern is 1600 \text{ cm}^21600 cm
2
1600, start text, space, c, m, end text, squared. They need to know the length of the pennant base.

How long is the base of each pennant?