File:Coni-tangenti-tra-loro.jpg
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[edit]DescriptionConi-tangenti-tra-loro.jpg |
Italiano: Due coni sono tangenti tra loro quando hanno una stessa generatrice in comune
per esempio in figura i due coni che hanno vertici in V e W ed hanno in comune la generatrice g sono tangenti tra loro. secondo il detto concetto, un ipotesi può essere la seguente: "In tutti i casi in cui sono date due coni con vertici qualsiasi (distinti, coincidenti) e con assi principali qualsiasi (incidenti o sghembi) e' possibile determinare un terzo cono tangenti ai dati coni." I detti due coni dati possono assumere tra loro i seguenti due posizioni:
I casi che sono stati affrontati fino a desso riguardava il caso A, ovvero quando i due coni hanno assi complanari. I sotto casi di A sono:
In tutti in i casi della sotto categoria A (in cui i due coni hanno assi complanari) esiste un piano tangenti a tali coni. Invece l'eventuale esistenza di un terzo cono tangente si e' verificata nel sotto caso A2 solo quando i dati due coni sono corrispondenti tra loro. Due coni sono corrispondenti tra loro quando le loro basi sono corrispondenti e anche i loro vertici.العربية: مخروطين يكونا متماسيين لبعضهما إذا كان هناك راسم واحد مشترك بينهما
على سبيل المثال الشكل المرفق يبين مخروطين متماسان لبعضهما، الراسم المشترك بينهما هو الخط ج الذي يمر بالقمتين ف فف للمخروطين في إطار هذا المفهوم ، من الممكن تكوين الافتراض التالي : "في جميع الحالات التي نقرر فيها مخروطين قمتيهما أي نقطتين (متطابقتين او منفصلتين) ومحاورهما أي خطين ( متحدتان المستوى أو متخالفان), من الممكن إيحاد مخروط ثالث متماس لهاذين المخروطين.. " هذين المخروطين يمكن أن يحتلان فيما بينهما موضعان فقط ، وهما : 1 -- عندما تكون محاورهما تكون أحاديه المستوى (بما في ذلك الحالة التي تكون فيها القمم متطابقة) ٢ وعندما محاورهما تكون متخالفة |
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Source | Own work |
Author | Hasanisawi |
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current | 11:59, 26 December 2011 | 1,013 × 290 (95 KB) | Hasanisawi (talk | contribs) | {{Information |Description ={{it|1=Due coni sono tangenti tra loro quando hanno una stessa generatrice in comune per esempio in figura i due coni che hanno vertici in V e W ed hanno in comune la generatrice g sono tangenti tra loro. }} {{ar|1=مخرو� |
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Horizontal resolution | 72 dpi |
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Software used | Adobe Photoshop CS2 Windows |
File change date and time | 13:47, 26 December 2011 |
Color space | sRGB |
Image width | 1,013 px |
Image height | 290 px |
Date and time of digitizing | 15:47, 26 December 2011 |
Date metadata was last modified | 15:47, 26 December 2011 |