Expand the side of a cylinder to get a square, the height of the cylinder is 31.4 cm, and the volume of the cylinder is how many cubic centimeters.
将一个圆柱的侧面展开，得到一个正方形，已知圆柱的高是31.4厘米，圆柱的体积是多少立方厘米．
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">78.5 * 31.4</gadget>
<output>2_464.9</output>

<result>2_464.9</result>