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4²+2² = c²
16 + 4 = c²
c = √20
Obw = 12 + 10 + 4 + 2√5 = 26 + 2√5
x²=20 /√
x=2√5 - dl. drugiego ramienia
Obw=12+10+4+2√5
Obw=26+2√5
Obw= 2(13+√5) cm
:)