Question

by using Integration solve the volume

Answer 1

step 1) http://www.wolframalpha.com/input/?i=16+%3D+x^2+-+10x+%2B+25

Answer 2

the 2nd step ?

Answer 3

step 2) \( \int 2\pi (x-5)(16-y) dx\)

Answer 4

\[ \int_{5}^{9} 2\pi(x-5)(16-y)dx\]

Answer 5

the other method would be
\[ \int_{0}^{16} \pi(x-5)^2dy\]