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Verified answer
Mapel = MatematikaBab = Sudut
Materi = Sudut
Sudut ACB
= 180° - BCD
= 180° - 110°
= 70°
180° = A + B + C
180° = 3x° + (3x - 10)° + 70°
180° = 3x° + 3x° - 10° + 70°
180° = 6x° + 60°
-6x° = 60 - 180°
-6x° = -120°
x = -120° / -6°
x = 20
Besar Sudut B
= 3x° - 10°
= 3(20°) - 10°
= 60° - 10°
= 50°
Jawabannya B. 50°
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