bantuin dong pleaae xD

2x + 4x = 180°
6x = 180°
x = 180/6
x = 30°

HFC = 4x
HFC = 4 x 30°
HFC = 120°

HFC + DBG = 180°
120° + DBG = 180°
DBG = 180° - 120°
DBG = 60°

semoga membantu!