Consider the integral r dz dr d theta Sketch the solid whose
     Consider the integral  r dz dr d theta.  Sketch the solid whose volume is given by this integral.  Evaluate the integral. 
  
  Solution
(0,/2).(0,2).(0,9-r2)r.dr.dz.d
(0,/2).(0,2).(9-r2)2/2.dz.d
/2.2.(9-r2)2/2=(9-r2)2/2
 

