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AB + BC + AC = 60
4 + 5 + 6 = 15
AB = 4/15 × 60 = 16 cm
semoga membantu ^^
keliling Δ ABC = AB + BC + AC = 60 cm
jumlah perbandingan = 4 + 5 + 6 = 15
panjang sisi AB = 4/15 × 60 cm
= 16 cm