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8 = a√2 |: √2
8:√2 = a
√2 ≈ 1,4
a ≈ 5,7
P= (8 * 8)/2
P= 32 cm^2
bok= pierwiastek z 32
pierwiastek z 32 ≈ 5,7
czyli
a√2=8/√2
a=4√2