Divide a cylinder with a diameter of 4 cm into several parts, then cut the cylinder and assemble it into an approximate cuboid with the same base and height. The surface area of the cuboid has increased by 40 cm2, what is the volume of the cuboid in cm3?
把一个直径为4厘米的圆柱体平均分成若干部分，然后把圆柱切开拼成一个与它等底等高的近似长方体．这个长方体的表面积增加了40平方厘米，长方体体积是多少立方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">40 / 2 / 2</gadget>
<output>10</output>

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

<result>125.6</result>