Question

Volumes and integration (cross sectional one axis) Anyone know how to solve this question:
https://drive.google.com/open?id=0B9fc3R9B2yEGa1RDTm5PMk9jb1E&authuser=0

Answer 1

Did you prove how x=.. or not?

Answer 2

no i didn't

Answer 3

do you know how to to?

Answer 4

I will do at night as I to go now :( sorry
I just have about 15 min ,so I will try :)

Answer 5

thank you :)

Answer 6

this looks pretty good on frustrum volume
https://www.youtube.com/watch?v=ADH7VwBjOdc

Answer 7

form similarities of triangles
\[\frac{ y }{ y+z } = \frac{ r }{ x }\]
and \[\frac{ y }{ y+h }=\frac{ r }{ R }\]
get x in terms of r and substitute the value of y from the 2 equation
OK @perl solved it :D