File:Retta-tangente-ellisse.jpg
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Summary
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Italiano: Una tangente all'ellisse in un suo punto P forma angoli uguali con le rette passanti per P e per ciascuno dei due fuochi.
العربية: ==خواص مماسية==
الخط المماس اهليج في نقطة P تكون زاويتين متساويتين مع الخطين المارين بالنقطة ب وبالبؤرتين F2, F1. دعونا نرى بعض النتائج المترتبة على هذا البيان. في طاولة بلياردو على شكل اهليج, إذا القينا على كرة على حفتها من إحدى بؤرتيها ستنعكس بالضرورة على البؤرة الأخرى. والشيء نفسه يحدث في مرآة مقعرة على شكل اهليج فيه جميع أشعة الضوء المنبعثة من بؤرة تمر بالضرورة بالبؤرة الأخرى بغض النظر عن اتجاه كل شعاع. وبالمثل ، في غرفة على شكل قطع ناقص الموجات الصوتية التي تبدأ في بؤرة تصل إلى البؤرة الأخرى من كل الاتجاهات وبما أن مسافة المسار للوصول من بؤرة إلى أخرى متساوية فان موجات تصل بشكل متزامنة تماما : هذا ما يفسر أيضا سهولة التواصل السمعي بين شخصين موضوعين في البؤرتين حتى إذا ما كانا متباعدين. وعلى هذا المبدأ يمكن ان يستند بناء بعض قاعات مسرح|المسارح. |
| Date | |
| Source | Own work |
| Author | Hasanisawi |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:21, 22 November 2011 | | 1,216 × 813 (122 KB) | Hasanisawi (talk | contribs) | {{Information |Description ={{it|1=Una tangente all'ellisse in un suo punto P forma angoli uguali con le rette passanti per P e per ciascuno dei due fuochi. Vediamo alcune conseguenze di questo enunciato. In un tavolo da biliardo a forma di ellisse u |
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