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Square Rod


A square rod (also called a perch or pole) is a unit of area used in land measurement. It is the area of a square with each side one rod long.



  • 1 rod = 16.5 feet (5.029 meters)



  • 1 square rod = 16.5 ft × 16.5 ft = 272.25 square feet ≈ 25.29 square meters



  • 160 square rods = 1 acre



Square rods were historically used in surveying and property descriptions.



Circular Inch


A circular inch is a unit of area used primarily in engineering and wire gauge measurements. It represents the area of a circle with a diameter of one inch.



  • Formula: Area = π × (radius)²



  • Since the radius is half an inch,

    Area = π × (0.5 in)² = π × 0.25 in² ≈ 0.7854 square inches (in²).



Circular inches are often used to specify cross-sectional areas of wires or pipes.



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