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Rood


A rood is a historic unit of area used primarily in England and some other countries for measuring land.



  • 1 rood = 1/4 of an acre



  • 1 rood = 10,890 square feet ≈ 1,012 square meters



  • 4 roods = 1 acre



The rood was traditionally used for measuring small plots of land, especially in farming and real estate.


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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