A piece of paper with a length of 20 cm and a width of 15 cm is circled into a cylinder, what is the maximum possible lateral area of the circled cylinder?
把一张长20厘米，宽15厘米的纸圈成一个圆柱体，圈成的圆柱体侧面积最大可能是多少．
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>