Step-by-step explanation:
Find the distance between points D and E, E and F, and F and D. Then add the 3 distances.
What is the first point I cant even see it? but all triangles equal 180 degrees so It's B becuase mg and me are 65 degrees 65+65 equals 130. 130 plus 50 is 180 thus your answer I hope I could help <span>(o^▽^o) <3</span>