msamba

How did they figure out the area of a circle is pi times r squared?

0:00 intro
3:10 Archimedes
6:25 Leonardo and Sato Moshun
8:20 RABH

https://en.wikipedia.org/wiki/File:%E…
https://en.wikipedia.org/wiki/William…
https://en.wikipedia.org/wiki/Aryabha…
Archimedes
https://en.wikipedia.org/wiki/Area_of…
Leonardo and Sato Moshun
https://en.wikipedia.org/wiki/Area_of…
Cut The Knot area of a circle
https://www.cut-the-knot.org/Curricul…
Area of a circle, formula explained (mathematicsonline)
• Area of a circle, formula explained
Understanding the Formula for Area of a Circle #shorts (mathematicsonline)
• Understanding the Formula for Area of a C…
Rabbi Abraham bar Hiyya Hanasi
https://www.cut-the-knot.org/Curricul…
Area of a Circle by Rabbi Abraham bar Hiyya Hanasi
https://u.cs.biu.ac.il/~tsaban/Circle…
David Garber and Boaz Tsaban, A mechanical derivation of the area of the sphere, The American Mathematical Monthly 108 (2001), 10–15.
https://u.cs.biu.ac.il/~tsaban/Pdf/Pu…
Wikipedia
https://en.wikipedia.org/wiki/Abraham…
https://en.wikipedia.org/wiki/Archime…

[…]

Jörg Altheimer (@jaltheimer.bsky.social) | Its not everyday that #Astrophotography has to take a backseat for northern lights this intense in southern Germany. First time for me to see them bright enough to cast shadows.