$\"\"$

\

The integral is $\"\"$ .

\

Here $\"\"$ , $\"\"$ and $\"\"$ .

\

Graph the area the function of $\"\"$ under given intervals.

\

Graph :

\

Graph the function $\"\"$ .

\

$\"\"$

\

The above area of the graph consists of one rectangle $\"\"$ and one quarter circle $\"\"$ .

\

Rewrite the integral into two parts .

\

$\"\"$

\

Evaluate the first integral.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Evaluate the second integral.

\

$\"\"$ .

\

Here $\"\"$ is quarter circle with radius $\"\"$ in the interval $\"\"$

\

$\"\"$

\

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .