530.9291585 squared inches to be exact.
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To be exact? Since when has it been possible to express an exact multiple of pi?
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A = 530.9
The circumference of a circle with a 13-inch radius is: 81.68 inches (r x 2 x pi = circumference).
radius of a circle = 13 metersArea of a circle =π * radius2radius = square root of Area/π=√531/π=√ 531/3.1416=√ 169= 13
Using 3.14 as Pi the area of circle is: 530.66
Well, area of a circle is (pi)r^2 and your diameter is 13, so your radius is 13/2 so your area would be (pi)(13/2)^2 or 132.7322896 =] -ray