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12+12+12+12=48
48=8*f /2
48=4f /:4
f=12 cm
z tw Pitagorasa
x²+y²=a²
x=f:2=12:2= 6cm
y=e:2=8:2= 4cm
6²+4²=a²
36+16=a²
a²=52 /√
a=√52=2√13
Obw=4a
Obw=4*2√13
Obw=8√13 cm