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ukuran2 sudut2 tersebut adalah:
180 = 3x + 4x + 5x
180 = 12x
x = 180/12 = 15
uluran sudut terkecil = 3 x 15 = 45°
3+4+5=12
dikali 15(karena 12×15=180(jumlah derajat segi tiga)
3×15=45
4×15=60
5×15=75
jadi sudut terkecil adalah 46