All you have to do is match their similar corresponding angles.
* These are congruent by the Angle-AngleSimilarityPostulate,where at least twoangles of both triangles are congruent, which in this case is ∠<em>L</em> [Vertical Angles Theorem] and ∠<em>Q</em> & ∠<em>M</em>. This obviously gives us our third side in each triangle, which must sum up to 180° altogether, therefore you have your answer.