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Area of a circle = pi*radius2

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Q: How many sq inches in a 12 circle?
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How do you find how many more square feet a 30 in circle is than a 18 in circle?

Area of 30 inch circle = pi*302 sq inches Area of 18 inch circle = pi*182 sq inches Difference = pi*(302 - 182) = 576*pi sq inches 1 sq foot = 1 ft*1 ft = 12 inches*12 inches = 144 sq inches so 576*pi sq inches = 576/144 *pi sq ft = 4*pi sq ft = 12.57 sq ft.


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Assuming that 12" round means a circle with a circumference of 12", its radius would be 12/(2*pi) = 6/pi inches. Its area would, therefore, be pi*(6/pi)2 = 36/pi sq inches. In terms of sq mm, that is 7393 sq mm (to 4 sig figs).


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1728 sq. in. 1 foot = 12 inches 1 sq. ft. = 12 in. x 12 in = 144 sq. in. 144 sq. in./ sq. ft. x 12 sq. ft. = 1728 sq.in.


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