How to calculate area of cross section from diameter?
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A= The cross-sectional area of the conduit in square feet (ft2). ... The area of a circle is π r2. The diameter of your hose is 5 inches, so the radius is half of that: 2.5 inches. That makes the cross-sectional area A = π (2.5 inches)2 = 19.63 inches2.
The cross sectional area of wire. Most wire is made with a circular cross section of some particular radius and diameter. The area of that cross section is the well known A = pi*R² which is colloquially pronounced as "pie are squared."
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