Hi there!
In order to figure out how to prove these triangles congruent, the best thing you can do is to flip them so that they are the same way. You can do this by drawing it out or going it in your head if you're able to visualize that. The triangles that you would have lined up are Triangle BAC and Triangle LKM. These triangles are congruent by ASA because they have two angles in common and one side.
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
