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Jawaban C.
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Jawabannya:Mapel. : Matematika
Bab. : Kesebangunan
Pembahasan:
Sudut DCE = Sudut ABC = 120°
Sudut ABC = Sudut ADC = 120°
Sudut BAD = Sudut BCD = x - 35°
Jadi :
4y = 120
y = 120/4
y = 30°
Sudut ABC + Sudut BCD + Sudut ADC + Sudut BAD = 360°
120° + (x - 35°) + 120° + (x - 35°) = 360°
240° - 70° + 2x = 360°
170° + 2x = 360°
2x = 360° - 170°
2x = 190°
x = 190°/2
x = 95°
Maka :
x + y
→ 30° + 95°
→ 125° → Opsi C
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