Step 1:
\The curve equations are
and
about
-axis.
Definition of volume:
\The volume of the solid
is
, where
is the cross sectional area of the solid
.

Now we find the intersection points of the two curves
and
.
Equate both the curves.
\
Now we find the volume of the region over the interval
and
.
Graph:
\
Step 2:
\Area of the region bounded by the curve
and
-axis is 
Area of the region bounded by the curve
and
-axis is 
Cross sectional area of the solid is
.

Step 3:
\Volume of the solid is
.
Substitute
,
and
.

Volume of the solid is
.
Solution:
\Volume of the solid is
.