cylinder has a lateral area of 628 square decimeters and a height of 50 centimeters. What is the volume of the cylinder?
一个圆柱的侧面积是628平方分米，高是50厘米，这个圆柱的体积是多少．
<gadget id="calculator">40 ** 2</gadget>
<output>1_600</output>

<gadget id="calculator">3.14 * 1_600 * 5</gadget>
<output>25_120</output>

<result>25_120</result>