File:Polarita-circonferenza-come-tangenza-piano-sfera.jpg

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Italiano: Polarità sulla circonferenza e' giustificata come tangenza di due piani ad una sfera
  • presa una sfera R e preso un punto V esterno ad K, si ha una circonferenza delta come luogo dei punti di tangenza condotti da V alla sfera K.
  • preso un altro punto V', si ha un altra circonferenza delta' come luogo dei punti di tangenza alla sfera condotti da V'.
  • congiungendo i due punti V V' si ha la retta p.
  • i due punti P Q d'intersezione tra le due circonferenze delta e delta' rappresentano i punti di tangenza alla sfera K dei due piani che hanno in comune la rette p
العربية: تبرير قطب خط بالنسبة لدائرة كتماس بين مستويين وكرة
  • بنعيين كرة ر ونقطة ف خارجية، نحصل على دائرة د كمحل هندسي لنقاط التماس بين الخطوط المارة بالنقطة ف والكرة ر*
  • وبتعيين نقطة أخرى ف نحصل بطريقة مماثلة على دائرة ثانية دَ*
  • بتحديد نقطتي التقاطع ب ك بين الدائرتين د دَ، نحصل على نقطتي المماس ب ك بين الكرة ر واثنين من المستويات المشتركة بالخط ق (الموصل النقطتين ف ف
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    Source Own work
    Author Hasanisawi

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    Date/TimeThumbnailDimensionsUserComment
    current22:48, 12 November 2011Thumbnail for version as of 22:48, 12 November 2011742 × 693 (123 KB)Hasanisawi (talk | contribs)più dettagli
    22:16, 12 November 2011Thumbnail for version as of 22:16, 12 November 2011930 × 662 (202 KB)Hasanisawi (talk | contribs)

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