tolong jawab pertanyaan diatas ?

K = M
2y - 15 = 57 - y
2y + y = 57 + 15
3y = 72
y = 72/3
y = 24

K = 2.24 - 15 = 48 - 15 = 33°
L = 180 - 33 = 147°
N = 147°