A cylinder whose base circumference is equal to its height, if the height increases by 1 cm, its lateral area will increase by 6.28 square centimeters, what is the original volume of the cylinder in cubic centimeters?
一个底面周长和高相等的圆柱，如果高增加1厘米，它的侧面积就增加6.28平方厘米，原来圆柱的体积是多少立方厘米？
<gadget id="calculator">6.28 / 1 / 3.14 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">6.28 / 1</gadget>
<output>6.28</output>

<gadget id="calculator">3.14 * 1 * 6.28</gadget>
<output>19.7192</output>

<result>19.7192</result>