Cut a 2cm long cylindrical steel into two sections, the surface area increases by 25.12dm**2, what is the volume of this steel in dm**3.
把一个长2cm的圆柱钢材截成两段，表面积就增加了25.12dm**2，这根钢材的体积是多少dm**3．
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12.56 * (1/5)</gadget>
<output>2.512</output>

<result>2.512</result>