A cylinder is 5 decimeters high, if the height increases by 3 decimeters, the surface area increases by 37.68 decimeters, what is the volume of the cylinder in cubic decimeters?
一个圆柱高5分米，如果高增加3分米，表面积增加37.68平方分米，则圆柱的体积是多少立方分米．
<gadget id="calculator">37.68 / 3 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 * 5</gadget>
<output>62.8</output>

<result>62.8</result>