Penjelasan dengan langkah-langkah:
mencari y=bac+acb=140
y+10+2y+10=140
3y+20=140
3y=140-20
3y=120
y=120/3
y=40
jadi bac=y+10=40+10=50
jadi sudut bac = 50
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Penjelasan dengan langkah-langkah:
mencari y=bac+acb=140
y+10+2y+10=140
3y+20=140
3y=140-20
3y=120
y=120/3
y=40
jadi bac=y+10=40+10=50
jadi sudut bac = 50