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Pica


A pica is a unit of length commonly used in typography and printing to measure font sizes, line lengths, and spacing. It is equal to 1/6 of an inch, or exactly 12 points in the point system.


Key facts:



  • 1 pica = 1/6 inch ≈ 4.233 millimeters



  • 1 pica = 12 points



  • Used primarily in graphic design, printing, and typesetting



  • Helps standardize the measurement of fonts, columns, and layouts



The pica remains a fundamental unit in desktop publishing and print design, helping maintain consistency in text and page formatting.



Perch


A perch is an old unit of length that is synonymous with the rod or pole, commonly used in land measurement and surveying. It measures 16.5 feet, 5.5 yards, or approximately 5.0292 meters.


The perch was widely used in England and later in the United States for measuring plots of land, especially before the widespread adoption of the metric system. It was also used to describe area when squared (square perch).


Key points:



  • 1 perch = 16.5 feet



  • 1 perch = 5.5 yards



  • 1 perch ≈ 5.0292 meters



  • 4 perches = 1 chain



  • 40 perches = 1 furlong



While largely obsolete today, the term perch still appears in historical land deeds, legal documents, and some traditional surveying contexts.



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