The height of a cylinder is 5 cm. If the height increases by 3 cm, the surface area of the cylinder increases by 37.68. What is the original volume of the cylinder in cubic centimeters?
一个圆柱体的高是5厘米，若高增加3厘米，圆柱的表面积就增加37.68，原来圆柱体的体积是多少立方厘米．
<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>