



 
Hi Tom. A fire hose has a round cross section, so that's a circular area. The area of a circle is π r^{2}. The diameter of your hose is 5 inches, so the radius is half of that: 2.5 inches. That makes the crosssectional area A = π (2.5 inches)^{2} = 19.63 inches^{2}. Since 1 foot = 12 inches, we see that 1^{2} foot^{2} = 12^{2} inches^{2}. This means to convert from 19.63 inches^{2} to feet^{2}, we divide by 144:
Cheers,  


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