They still subject people to these ?truncated cone
We saw them in the alst year of HS, never needed to know anything about them again (and I'm an engineer).
What i think:
first a formula for the area of a cirkel:
2 pi int(r dr)
now integrate it over the height
2 pi int(int(r dr) dx)
with dr/dx =0.1 -> dx=10dr
20 pi int(int(r)dr dr )
You now have a double integral over r, solving it you get
20/6 pi r^3 between r=3 and r=4
calculate that and you should get the volume.
I checked using the basic cone formulas, it should be correct, i hope this isn't for credit ...![]()
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