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Some Concepts about "Cone"

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• Right Cone
  • Case where the base is a rotationally-symmetrical shape, and right above its center O the vertex V lies.
  
  
• Regular Cone
  • Case where the base is a regular rotationally-symmetrical shape, and right above its center O the vertex V lies.
  
  
• Pyramid
  • Case where the base is a polygon
  • "triangular pyramid"
  
  
• "truncated cone"