Master Wang wants to make 10 iron chimneys with a square cross section. It is known that the side length of the cross-section of the chimney is 1dm, and the length is 2.5m. How many square meters are shared by the tin sheet?
王师傅要制作10节横截面是正方形的铁皮烟囱．已知烟囱横截面边长是1dm，长是2.5m，共用白铁皮多少平方米？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 4 * 2.5 * 10</gadget>
<output>10</output>

<result>10</result>