Oh, dude, you're hitting me with some math here! So, the area of a circle is π times the radius squared. If the diameter is 40 feet, the radius is 20 feet. Plug that into the formula, and you get an area of 400π square feet. But who's really counting, right?
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7.0686 square feet for a 3-foot diameter circle.
50.3 square feet for an 8-foot diameter circle.
803.84 feet
The circumference of a 19 foot diameter circle is: 59.7 feet.
Diameter = 7 feet Radius = 3.5 feet Area of circle = pi x r x r = 3.1415 x 3.5 x 3.5 =38.483 square feet.