Expand the side of the next cylinder to get a square whose side length is 31.4 cm. What is the volume of this cylinder?
将下个圆柱的侧面展开，得到一个边长是31.4厘米的正方形，这个圆柱的体积是多少？
<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 * 31.4</gadget>
<output>2_464.9</output>

<result>2_464.9</result>