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maka...
sudut A + sudut B = 180°
3x°+12° + 2x°+8° = 180°
5x° + 20° = 180°
5x° = 180°-20°
5x°= 160°
x° = 160°÷5
x° = 32°
jadi besar sudut A=3x°+12°
= 3.32° +12°
= 96° +12°
= 108°