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16x=40 |:16
x=2,5
I bok - 10
II bok - 12,5
III bok - 17,5
b = 5cm
c = 7cm
Obwód₁ = 40cm
Obwód ₂= 4cm+5cm+7cm=16cm
k = Obwód₁ : Obwód₂ = 40cm : 16cm = 2,5
a = 2,5*4cm = 10cm
b = 2,5*5cm = 12,5cm
c= 2,5*7cm =17,5cm
odp. Boki to 10cm . 12,5cm . 17,5cm