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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

  
  

Centimeter and Square Centimeter – A Short Note

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

1 centimeter = 10⁻² meters (0.01 meters)

Centimeters are widely used to measure everyday objects like the length of a pencil, the width of a book, or the height of a small plant.

A square centimeter (symbol: cm²) is a unit of area that represents a square with sides one centimeter long:

1 cm² = (10⁻² m) × (10⁻² m) = 10⁻⁴ m²

Square centimeters are commonly used to measure surface areas of small objects, like the size of a photograph, a piece of fabric, or the area of a label.

In summary:

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  Centimeter (cm) measures lengths at a human-scale level

  
  
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  Square centimeter (cm²) measures areas of small to medium-sized surfaces

  
  
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  Used frequently in education, crafts, science, and everyday measurements