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b=5cm
c=7cm
Obw₁=40cm
Obw₂=4cm+5cm+7cm=16cm
k=Obw₁ : Obw₂=40cm : 16cm=2,5
a'=2,5*4cm=10cm
b'=2,5*5cm=12,5cm
c'=2,5*7cm=17,5cm
Boki tego trojkata to 10cm, 12,5cm i 17,5cm.
L₂=4+5+7=16cm
k=16:40=0,4
a=4:0,4=10cm
b=5:0,4=12,5cm
c=7:0,4=17,5cm