A cylinder has a lateral area of 100 square meters and a base radius of 4 meters, what is its volume?
一个圆柱体的侧面积是100平方米，底面半径是4米，求它的体积是多少？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<result>200</result>