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36+x²=x²+4x+4
4x-32=0
4x=32 /÷4
x=8 d=x+2=8+2=10 (dł. przekątnej)
a=6
b=x=8
P=a*b=6*8=48
Obw.=2a+2b=2*6+2*8=12+16=28