Mohon bantuannya nya ya , soal A dan B : terimakasih

< ABC = < FCG
3x - 45 = x + 23
3x -x = 23 + 45
2x = 68
x = 68/2
x = 34
< FCG = 34 + 23 = 57*
< BCF + < CFG = 180* ( berpelurus )
< BCF = 180* - 57*
< BCF = 123*