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Jumlah perbandingan adalah 4 + 5 = 9
Sudut B = 4/9 x 180
= 4 x 20
= 80
sudut C = 5/9 x 180
= 5 x 20
= 100
Sudut A = 90, Sudut B = 80, Sudut C = 100 dan Sudut D = 90