Tentukanlah besar sudut abc, acb, acg, fcg

A. Sudut abc = 180-120
= 60
B. Sudut Acd=180-55-60
=125-60
=65
C.acg= 180-65
= 115
D. Fcg=180- sudut acg
=180-115
=65

ABC = 180 - ABD
ABC = 180 - 120
ABC = 60

ACB = 180 - (60 + 55)
ACB = 180 - (115)
ACB = 65

ACG = 180 - ACB
ACG = 180 - 65
ACG = 115

FCG = ACB
FCG = 65