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Sudut A + sudut B + sudut c + sudut D = 360 (A dan D siku-siku)
90 + 4x + 5x + 90 = 360
9x = 360 - 90 - 90
9x = 180
x = 180/9 = 20
sudut B = 4x = 4.20 = 80
Sudut C = 5x = 5.20 = 100