Kakak2 yang bisa soal di gambar tolong ya..

Sdt ABC
= 180 – 120
= 60°

sdt ACB
=180 – 60 – 55
= 65°

sdt ACG
= 180 – 65
= 115°

sdt FCG
= sdt ACB
=65°

sdt BCF
=sdt ACG
= 115°

sdt EBC
= sdt ABD
= 120°

sdt DBE
= sdt ABC
= 60°