After cutting a cylinder into two parts along the diameter of the bottom surface, the surface area increases by 40 square centimeters. It is known that the radius of the bottom surface of the cylinder is 2 centimeters. What is its volume in cubic centimeters?
把一个圆柱体沿底面直径切成两个部分后，表面积增加了40平方厘米，已知圆柱底面半径是2厘米，它的体积是多少立方厘米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

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

<gadget id="calculator">40 / 2 / 4</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 4 * 5</gadget>
<output>62.8</output>

<result>62.8</result>