The radius of the base is 2 cm, and the lateral area of the cylinder is 31.4 square centimeters. What is the volume of the cylinder in cubic centimeters?
底面半径是2厘米，圆柱侧面积是31.4平方厘米，这个圆柱体的体积是多少立方厘米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">31.4 / 12.56</gadget>
<output>2.5</output>

<gadget id="calculator">3.14 * 4 * 2.5</gadget>
<output>31.4</output>

<result>31.4</result>