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d=a√2
5=a√2 /√2
5/√2 =a
a=5√2/2 cm
obw=4a
obw=4*5√2/2
obw=10√2 cm
d=5
5=a√2
a=5/√2
a=5√2 / 2
O= 4 × 5√2 / 2
O=20√2 / 2
O=10√2
Pk=5*5*0.5
Pk=25*0,5
pk=12.5
pk=a*a
12.5= a*a / razy pierwiastek
3.5=a
o=4a=14