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d=a√2=2r
a√2=2*8
a√2=16
a=16/√2
a=16√2/2
a=8√2 cm
P=(8√2)²
P=64*2
P=128 cm²
P=(e*e) * ½
P=(8*8)* ½
P=64:2
P=32cm ²
czyli 8
8(pierwiastków z 2)do kwadratu wyjdzie 128)
prosze