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II bok - x
przekątna - x+2
8²+x² = (x+2)²
64+x² = x²+4x+4
64 = 4x+4
64-4 = 4x
4x = 60 |:4
x = 15
I bok - 8cm
II bok - 15cm
przekątna - 15cm+2cm = 17cm
obw = 2(8cm+15cm) = 2*23cm = 46cm