If a cylinder with a height of 1 meter is sawed into three sections, the surface area increases by 12.56 square meters. What is the original volume of the cylinder?
把高是1米的圆柱锯成三段，表面积增加了12.56平方米，原来这个圆柱的体积是多少．
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

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

<result>3.14</result>