A cylindrical steel bar with a length of 2 meters is sawed into two pieces, and the base area increases by 4 square centimeters. What is the original volume of the steel bar?
一个长2米的圆柱体钢条，被锯成两段后底面积增加了4平方厘米，这根钢条原来的体积是多少．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">2 * 200</gadget>
<output>400</output>

<result>400</result>