r = 5.0463
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If the radius of a circle is 80 inches, then the area of the circle is 139.6263 square feet. (rounded)
A circle with a radius of 80 inches has an area of 139.6 square feet A circle with a circumference of 40.5 feet has an area of 130.5 square feet
The area of a circle of radius 21 is 1386
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared