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We used the surface area of ​​a truncated cone to calculate the surface area of ​​a sphere. But before that, we needed to go over some important formulas related to cones. It was a challenging but enjoyable video for me. I hope you enjoy watching. Haluk Memili You can check my Superpeer profile for exam preparation lessons. https://superpeer.com/pisagor (You can support the channel by becoming a member via the 'Join' button below the video.) To become a member:    / @pisagorokulu   You can also follow Pythagoras School on Facebook, Twitter, and Instagram. Our Instagram account:   / pisagormath   Our Twitter account:   / pisagormath   Our Facebook account:   / pisagor   Basic Mathematics playlist:    • Sayı Kümeleri - (Temel Matematik #1)   Proof Videos playlist:    • Gauss Yöntemi - (MATEMATİK ve İSPAT)   Questions for the Curious playlist List:    • Meraklısına Sorular - 1 (Olimpiyat Sorusu)   Thank you very much to Cihat Besnili, Alperen Yavuz Çam, Emirhan Gür, Halil Ulu, Elbi Hatiper, Mustafa Ersin İşbilir, Berk Çetinel, Sena Aşçı, Murat Yaşar Kurt, Refik Şekercioğlu, Hasan Keklik, Utku Aytaç, Mustafa Umut Kazancıoğlu, Derviş İbrahim and all our members for their support to the channel. (You can also support us by clicking on the link.    / @pisagorokulu  ) #geometry, #pythagoras #mathematics