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Itu foto jawaban nya semoga membantu ya..^-^Kelas IX
∠C = 56°
C = 210 kg
∠D = (360° - 56° - 90° - 142°) = 72°
D = _ ?
∠D / ∠C = D / C
72 / 56 = D / 210
D = 72 x 3,75
D = 270 kg [C]