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3) 150 : 2 = 75°4) 250/150 = x/30
5/3 = x/30
x = 50°
maka ACB = ½*(180°-75°), karena jumlah sudut pasa segitiga adalah 180°
ACB = 52,5° ✔️
4. luas juring COD = 30°/150° * 250cm²
= 50cm² ✔️
semoga jelas dan membantu