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Millimeter and Square Millimeter – A Short Note


A millimeter (symbol: mm) is a unit of length in the metric system, equal to:


1 millimeter = 10⁻³ meters (0.001 meters)


Millimeters are commonly used to measure small lengths and thicknesses in everyday life, such as the diameter of a pencil, the thickness of paper, or small machine parts.


A square millimeter (symbol: mm²) is a unit of area representing a square with sides one millimeter long:


1 mm² = (10⁻³ m) × (10⁻³ m) = 10⁻⁶ m²


Square millimeters are often used to measure surface areas in small objects, like the cross-sectional area of wires, small patches of skin, or the surface of tiny electronic components.


In summary:



  • Millimeter (mm) measures small lengths in daily life and engineering



  • Square millimeter (mm²) measures small areas on a scale larger than microscopic but still quite small



  • Commonly used in engineering, manufacturing, and medicine



Kilometer and Square Kilometer – A Short Note


A kilometer (symbol: km) is a unit of length in the metric system, equal to:


1 kilometer = 1,000 meters


Kilometers are commonly used to measure long distances, such as the length between cities, the distance traveled by vehicles, or the size of large geographical features.


A square kilometer (symbol: km²) is a unit of area representing a square that is one kilometer long on each side:


1 km² = (1,000 m) × (1,000 m) = 1,000,000 m²


Square kilometers are widely used to measure large surface areas, like the size of cities, countries, forests, or lakes.


In summary:



  • Kilometer (km) measures long lengths or distances



  • Square kilometer (km²) measures large areas



  • Commonly used in geography, travel, and land measurement




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