volume of a revolution_why f^2(x)?

2022-11-23 18:18 作者:第一性原理 0人读过 | 我要投稿

why?

$%5Cpi%20f%5E2(x)%20$

because:

$Area%3D%5Cpi%20r%5E2%3D%20%5Cpi%20f%5E2(x)$

Bibliography:

1.https://en.wikipedia.org/wiki/Solid_of_revolution

2.https://images.adsttc.com/media/images/5c48/5a26/284d/d1e4/9600/01c4/large_jpg/6_China_Resources_HQ_Spire_Axon_Credit_KPF.jpg?1548245476

3.https://images.adsttc.com/media/images/5c48/5d36/284d/d1d5/0e00/0070/large_jpg/9_China_Resources_HQ_Credit_Tim_Griffith.jpg?1548246313

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