#1 solid surface of revolution

<font color=red>
  <br>with(Student[Calculus1]): with(plots):
  <br>plot(sqrt(x),x=0..4);
  <br>VolumeOfRevolution(sqrt(x),x=0..4,output=plot);
</font>

<br><br>#2 annular surface of revolution with washers  <font color=red>
   <br>a:=VolumeOfRevolution(0,x=0..4,distancefromaxis=3,output=plot):
  <br>b:=VolumeOfRevolution(sqrt(x),x=0..4, distancefromaxis=3,output=plot):
  <br>display(a,b);
</font>
<br>
<!a href="http://www.mathdemos.org/mathdemos/washermethod/gallery/">
<a href="washers_5_1washer.gif">washer annulular disk</a>,
<a href="washers_5_solid.gif">washer animation surface</a>
<br><br>#3 annular surface of revolution with washers
<font color=red>    <br>a:=VolumeOfRevolution(4,y=0..2,output=plot):
  <br>b:=VolumeOfRevolution(y^2,y=0..2,output=plot):
  <br>display(a,b);
</font>
<br><br>#4 acorn solid of revolution 
<font color=red>
    <br>VolumeOfRevolution(y^2,y=0..2,distancefromaxis=4, output=plot); </font>