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d=a√2
16=a√2
8√2=a
P=8√2*8√2
P=128cm²
przekątna = a√2
16=a√2 / : √2
16/√2 = a
(16√2) : 2 = a
a=8√2
pole = a²
(8√2)²=64*2=128 cm²