tolong jawab no 17 ama 18 ama caranya yang lengkap ama bener jawabanya... mau dikumpulin

semoga bermanfaat yaa

55 + x = 180
x = 180 - 55
x = 125
(C)

18. Mencari nilai B1 + B2 = 180
120 + B2 = 180
B2 = 180 - 120
B2 = 60

B2 = A = 60

B2 + A + C3 = 180
60 + 60 + C3 = 180
120 + C3 = 180
C3 = 180 - 120
C3 = 60
(C)