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r=8 - promien okregu
r=1/2d czyli polowa przekatnej kwadratu
d=a√2
r=1/2 a√2
8=1/2 a√2
16=a√2
a=16:√2
Pole kwadratu= a²= 256:2=128
r= 8 cm
r=½ a
8=½ a /x 2
a = 16cm
P= a²
P= 16²
P= 256 cm²