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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

  
  

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:

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

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

  
  
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  Commonly used in engineering, manufacturing, and medicine