Solve these tasks:
A rectangle with sides 
and 
rotates around side 
. Calculate the area and volume of the body formed.
A triangle ABC with sides 
, 
and 
rotates around side 
. Calculate the area of the resulting spindle.
Turn a curve with equation 
at interval 
around the abscissa axis. Calculate the volume of the resulting spindle.
; Volume of the body: 
