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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

  
  

Foot and Square Foot – A Short Note

A foot is a unit of length in the imperial and U.S. customary systems. One foot is equal to 12 inches or approximately 30.48 centimeters. It is commonly used to measure height, length, or distance—such as a person's height, the length of a room, or the size of an object.

A square foot (written as ft²) is a unit of area. It represents a square that is one foot long and one foot wide. One square foot is equal to 144 square inches or approximately 0.093 square meters. It is widely used in real estate, architecture, and construction to measure floor space, land area, or surface coverage.

In simple terms, a foot measures how long something is, while a square foot measures how much space it covers. Knowing the difference is essential when dealing with both length and area in everyday tasks or professional work.