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2x- dł grugiego boku
2x*x=98
2x²=98
x²=49
x=7
2x=14
2x²=98 I÷2
x²=49
x=7
Obw= 2*7+2*(2*7)=14+2*14=14+28=42(cm)
Odp: Obwód wynosi 42cz.