After cutting the cylinder with a height of 10 cm into an approximate cuboid, the surface area increases by 40 cm2. What is the volume of the cylinder in cubic centimeters.
把高是10厘米的圆柱切拼成一个近似的长方体后，表面积增加了40平方厘米．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>4</output>

<gadget id="calculator">3.14 * 4 * 10</gadget>
<output>125.6</output>

<result>125.6</result>