A piece of paper with a length of 18.84 cm and a width of 12.56 cm is circled into a cylinder. What is the maximum possible area of the base of the circled cylinder?
把一张长18.84厘米，宽12.56厘米的纸圈成一个圆柱体，圈成的圆柱体底面积最大可能是多少．
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>