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Jumlah sudut segitiga = 180°
Jumlah perbandingan = 2+3+4 = 9
Sudut terkecil = 2/9 x 180 = 40°
= 3/9 x 180 = 60°
4/9 x 180 = 80°
yang terkecil 40°
2x + 3x + 4x = 180°
9x = 180°
x = 20°
sudut terkecil = 2x = 2(20°) = 40°