Area = Pi(d/2)2 = Pi*6.52 = approximately 132.73 inches2
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Well, darling, to find the area of a circle, you use the formula A = πr^2. Since the diameter is 26 feet, the radius is half of that, which is 13 feet. Plug that into the formula, and you get an area of approximately 530.66 square feet. Voila!
Well, darling, if the circumference of a circle is 13 inches, then the diameter would be approximately 4.14 inches. You can find this by dividing the circumference by pi (3.14). So grab a measuring tape and get to work, honey!
Diameter is twice the radius, therefore the radius is half the diameter. 13/2 = 6.5
Circumference = pi*13 yards
The circumference of a 13-foot diameter circle is: ~40.84 ft