Tolong dijawab ya *Sama caranya

Garis dan Sudut

<BDC + <ADC = 180°
2X - 10 + 3X = 180°
5X - 10 = 180°
5X = 180 + 10
5X = 190
X = 190/5
X = 38

<BDC = 2X - 10
<BDC = 2 x 38 - 10
<BDC = 76 - 10
<BDC = 66° (B).

*semoga membantu. sukses selalu ^_^