Answer :
[tex]7\pi y^2\ represent\ the\ area\ of\ 7\ circles.\\\\Area\ of\ the\ circle:A_O=\pi r^2\ where\ r\ is\ a\ radius\ of\ the\ circle.\\\\In\ your\ example\ r=y\ therefore\ area\ of\ the\ one\ circle\ is\ equal:\\\\A_O=\pi y^2\\\\area\ of\ the\ 7\ circles\ is\ equal\ 7A_O=7\pi y^2[/tex]