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A = 2x
B = x
C = 5x
∠B + ∠C = 180°
x+5x = 180°
x = 180°/6
x = 30°
dan
∠A + ∠D = 180°
2x+∠D = 180°
∠D = 180°-(2.30)°
∠D = 120°