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∠NOK = ∠MOL
∠NOK =
∠NOK = 60°
KNO segitiga sama kaki, maka
∠KNO = ∠NKO
∠KNO =
∠KNO = 60°
(8) D. ∠AOD
(9) ∠RTS = ∠QTP
∠QPT = ∠TQP
∠QTP + ∠QPT + ∠TQP = 180°
(7a+25)° + (a+10)° + (a+10)° =180°
9a + 45 = 180°
9a = 135
a = 15
(10) B