The length of the rectangle in the expanded view of the cylinder is 31.4 cm, and the height is 3 cm. What is the volume of the cylinder?
圆柱的展开图长方形的长是31.4厘米，高是3厘米，算一算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 * 3</gadget>
<output>235.5</output>

<result>235.5</result>