A cylinder whose height is 12 centimeters, now the height increases to 15 centimeters, the side area increases by 376.8 square centimeters, what is the volume of this cylinder?
一个圆柱体，它的高是12厘米，现在高度增加到15厘米，侧面积就增加了376.8平方厘米，请求出这个圆柱体的体积？
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">376.8 / 3</gadget>
<output>125.6</output>

<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 15</gadget>
<output>18_840</output>

<result>18_840</result>