Explain how you can prove rst is congruent to uvw by asa

Well, to prove two triangles congruent by ASA, you have to figure out how two angles and a side of the triangles are congruent. So if you were to prove ∠R =∠U, and ∠T = ∠W, you would just have to prove that one of each of the sides were congruent. Sorry I couldn't help more. 

Hope this helps! :)