perim. = AB + BC + AC
AB = 8AC / 5
BC = 4AC / 2· 3 = 2AC / 3
8AC / 5 + 2AC / 3 + AC = 147 NUMITOR 15
24AC + 10AC + 15AC = 15 · 147
49AC = 15 · 147 impartim cu 49
AC = 15 ·3 = 45 cm
AB = 8 · 45cm / 5 = 8 · 9 cm = 72 cm
BC = 2 · 45 cm / 3 = 2 · 15cm = 30cm