$\"\"$

The angles are $\"\"$ .

In a triangle sum of angles are $\"\"$ .

$\"\"$

$\"\"$ (Add: $\"\"$ )

$\"\"$

$\"\"$ (Divide each side by 12)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ )

So, $\"\"$ , $\"\"$ , $\"\"$

So, the angle measures are $\"\"$ . $\"\"$

The value of x is $\"\"$ . The angle measures are $\"\"$ .

$\"\"$ is an obtuse angle. So, the triangle is an obtuse triangle.