https://www.youtube.com/watch?v=6APNDuW5WaM
https://www.youtube.com/watch?v=oMOpfBVJD1Y&list=PLZxjsvw39Ev5tPvVR3DirBJ2Xpr4MaMc2&index=1
on wandering life's journey
建築系に必要な数学の知識がまとめられている
http://kentiku-kouzou.jp/danmen2zi.html
https://secondinspire.com/vol6-5moment_of_inertia/
https://www.youtube.com/watch?v=8Ra5RmJFaLE
https://www.youtube.com/watch?v=WC6n-whoPPg
https://www.youtube.com/watch?v=FY8kf3zfGKo
長方形
http://kentiku-kouzou.jp/struc-tyouhoukeidanmen2zimoment.html
https://www.oribi.work/entry/Sectional-moment-of-inertia
曲げモーメント
https://seihin-sekkei.com/material_mechanics_words/section_modulus/