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3 : 4 : 5 = 3x : 4x : 5x
maka :
5x - 3x = 14
2x = 14
x = 14/2 = 7
K = 3x + 4x + 5x
K = 12x
K = 12.7
K = 84
terpanjang = 5/2 x 14 = 35
terpendek = 3/2 x 14 = 21
sisi ke 2= 4/5 x 35= 28
jadi keliling = 21+35+28 = 84 cm