The function are
and
and 
Graph :
\Graph the functions
:

Observe the graph :
\The area of the region bounded by the curves is
.
The centroid of the region is
.
\
Find the centroid
.
.
Substitute
,
and
in above equation.

Power rule of integral:


.
.
Substitute
,
and
in above equation.


Power rule of integral:
.



The centroid of the region is 
The centroid of the region is 