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How do you find how many more square feet a 30 in circle is than a 18 in circle?
Wiki User
∙ 10y ago
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.
Wiki User
∙ 10y ago
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