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what is the perimeter of a square of side 10 2/5 dm 

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Riza1viz
[tex]side : \ 10\frac{2}{5}\ dm \\\\ perimeter \ of \ a \ square :\\\\ P =4a \\ \\P=4\cdot 10\frac{2}{5}=4\cdot \frac{52}{5}= \frac{208}{5}=41.6\ dm \\\\Answer: \ the \ perimeter \ of \ a \ square \ is \ 41.6 \ dm[/tex]