Geometri (tüm içerik)
- İspat: Paralelkenarın Karşılıklı Kenarları
- İspat: Paralelkenarın Köşegenleri
- İspat: Paralelkenarın Karşılıklı Açıları
- Dörtgende Açılar
- İspat: Eşkenar Dörtgenlerin Köşegenleri Birbirlerinin Orta Dikmeleridir
- Özel Bir Dörtkenar Olabilir mi?
- Eşkenar Dörtgen
İspat: Paralelkenarın Köşegenleri
Sal Khan, bir dörtgenin, ancak ve ancak köşegenleri birbirlerini ortadan ikiye bölerse paralelkenar olduğunu ispatlıyor. Orijinal video Sal Khan tarafından hazırlanmıştır.
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