Graph of $\"\"$ is given.

The area of the graph consists two triangles and one semicircle.

$\"\"$

(a) The integral is $\"\"$ .

$\"\"$

(b)

The integral is $\"\"$ .

$\"\"$ .

Here the radius of the semi circle is $\"\"$ .

$\"\"$ .

The integral should be negative since the semicircle is below the $\"\"$ axis.

$\"\"$ .

(c)

The integral is $\"\"$ .

$\"\"$

$\"\"$ .

Substitute corresponding values in above expression.

$\"\"$ .

(a) $\"\"$ .

(b) $\"\"$ .