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jumlah perbandingan 3 : 4 : 5 = 12
jumlah perbandingan sudut = 3+ 4+ 5= 180°
3/12 × 180° = 45°
4/12 × 180° = 60°
5/12 × 180° = 75°
dua sisi terpendek 45° : 60° = 3 : 4