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= 1/2 × 70
= 35 derajat
∠AOD = 180 ° - ∠AOB
= 180° - 70°
= 110°
∠ACD adalah sudut keliling dari sudut pusat ∠AOD, maka
∠ACD = 1/2 x ∠AOD
= 1/2 x 110°
= 55°
semoga membantu :)