Calculate volume of ring

Answer 1

let the outer radius of the ring be R

inner radius r

n cross sectional radius be y

then the volume of the ring will be

(pi)y2 X (pi)(R-r)/2

i.i the cross sectional area multiplied by the length of the ring when it was a line

the length is taken at the midpoint of the thickness of the ring = (R-r)/2