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więc liczymy przekątną z wzoru pitagorasa
x²=11²+(x-1)²
x²=121+x²-2*x*(-1)+(-1)²
x²=121+x²-2x+1
2x=122 /÷2
x=61
przekątna to 61 cm
2 bok to 61-1=60 cm
obw= 60*2+11*2
obw=142 cm