ABD + DBC = 180°
100° + DBC = 180°
DBC = 80°
Jumlah sudut segitiga = 180°
SBC + BCS + CSB = 180°
SBC + 80° + 70° = 180°
SBC = 30°
X = DBC - SBC
X = 80° - 30°
X = 50°
Jawabannya adalah E.
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ABD + DBC = 180°
100° + DBC = 180°
DBC = 80°
Jumlah sudut segitiga = 180°
SBC + BCS + CSB = 180°
SBC + 80° + 70° = 180°
SBC = 30°
X = DBC - SBC
X = 80° - 30°
X = 50°
Jawabannya adalah E.