$\"\"$

The angle of triangle $\"\"$ and its sides are $\"\"$ .

Apply the law of cosines to find the un known side a of the triangle.

$\"\"$ (Write law of cosines)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Use calculator)

$\"\"$ (Simplify) $\"\"$ $\"\"$ (Write alternative form of law of cosines)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Simplify)

$\"\"$ (Use calculator)

The remaining angle $\"\"$ . $\"\"$

The solutions are $\"\"$ .