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sisi berpelurus = 180°
sudut siku siku = 90°
180-130 = 50° ⇒ 50° + 90° = 140°
180° - 140° = 40°
sudut bcd = 180° - 40° = 140°
sudut abc = 90 °
sudut BCA = 180-90-50= 40°
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jadi sudut bcd adalah 180-40= 140°