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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:

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  Kilometer (km) measures long lengths or distances

  
  
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  Square kilometer (km²) measures large areas

  
  
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  Commonly used in geography, travel, and land measurement

  
  

Inch and Square Inch 

An inch is a unit of length commonly used in the United States and other countries following the imperial system. It is equal to 1/12 of a foot or approximately 2.54 centimeters. Inches are typically used to measure small distances or dimensions, such as the size of a screen or the height of an object.

A square inch (written as in²) is a unit of area that represents a square with sides that are one inch in length. It is used to measure surface area, such as the area of a piece of paper, a screen, or a section of flooring. One square inch equals 6.45 square centimeters.

While inches measure one-dimensional length, square inches measure two-dimensional area. Understanding the difference between the two is important in fields such as construction, design, and manufacturing where both length and area are frequently calculated.