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2x = 180-60
2x = 120
x = 120/2
x = 60
∠BOC = x + 60
= 60 + 60 = 120⁰
∠AOB = x
= 60⁰
∠AOD = ∠BOC = 120⁰
∠BOD = 120 + 60 = 180⁰
∠DOC = ∠AOB = 60⁰
x + x + 60 = 180
2x = 180 - 60
2x = 120
x = 120 : 2
x = 60
jawabn
BOC = x + 60
= 60 + 60
= 120
AOB = x
= 60
COD = 180 - 120
= 60
AOD = 360 - AOB - BOC - COD
= 360 - 60 - 120 - 60
= 120
BOD = AOB + AOD
= 60 + 120
= 180