Question

(Volume of rotation)

"Show that the volume of a torus (doughnut shape, or inner tube) is (2πR)(πr^2) where r is the radius of the 'tube' and R is the radius of the 'ring' (measured to the centreline of the tube)."

Answer 1

ok

Answer 2

saw i rotate around this axis like so

Answer 3

It's rotating around the x-axis.

Answer 4

samething

Answer 5

Oh my bad!

Answer 6

so what would radius be as a function of x or y