Fencing Problem - Brittany's solution

I measured the internet connection cord. It was about 60 cm long. The maximum area is 225 cm. Each side of the perimeter fencing will be 15 cm.

Hey so I have completed my assignment on "fencing" and this is what I have come up with.
By using the cord on the mouse I measured 5 feet. By using graphmatica and the formula my solution is 1.25 feet.