Let's formulate the question in another way:
"What is the area of a circle with a perimeter of 60 ft?"
Solution:
C = 2 pi r (replace C with 60 ft)
60 ft = 2 pi r (divide by 2 pi to both sides)
(30/pi) ft = r
A = pi r (replace r with (30/pi ft))
A = pi (30/pi ft)2 = 900/pi ft2 ≈ 286.5 ft2
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A circle with a 60-foot circumference has an area of 286.48 square feet.
Circumference of the circle = 60*pi feet
60 x 40 feet = 2400 square feet
60 times 120 = 7200 square feet
The length times width will give you the area. So this comes out to 60 square feet.