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Jawaban Terkonfirmasi
∠DOC + ∠COB + ∠BOA
(x – 5)° + 1,5x° + (x + 10)° = 180°
3,5x + 5 = 180
3,5x = 175
x = 50°
∠BOA = (50 + 10)° = 60°
<DOC +<COB + <BOA = 180
(x – 5) + 1,5 x + (x + 10) = 180
x + 1,5x + x – 5 + 10 = 180
3,5x + 5 = 180
3,5x = 180 – 5
3,5x = 175
x = 175 / 3,5
x = 50
<BOA = x + 10 = 50 + 10 = 60