The height of a cylinder is 10 cm, and the surface area of the longitudinal section along the diameter of the base of the cylinder increases by 40 cm2, what is the original volume of the cylinder in cubic centimeters?
一个圆柱的高是10cm，沿着圆柱的底面直径纵切表面积增加了40平方厘米，原来圆柱的体积是多少立方厘米．
<gadget id="calculator">40 / 2 / 10</gadget>
<output>2</output>

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

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

<gadget id="calculator">3.14 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>