If the lateral area of a cylinder is 100 square centimeters and the radius of the base is 4 centimeters, what is its volume in cubic centimetres?
一个圆柱的侧面积是100平方厘米，底面半径是4厘米，它的体积是多少立方厘米．
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

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

<result>200</result>