If 10cm is cut off from a cylindrical steel with a length of 80cm, the surface area is reduced by 62.8cm**2. What is the original volume of the steel?
把一根长80cm的圆柱形钢材截掉10cm，表面积减少了62.8cm**2，原来这根钢材的体积是多少．
<gadget id="calculator">62.8 / 10 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 80</gadget>
<output>251.2</output>

<result>251.2</result>