The advertising company has made a cylindrical light box with a bottom diameter of 2 meters and a height of 2 meters. What is the maximum area in square meters that posters can be posted on its side.
广告公司制作了一个底面直径是2米，高2米的圆柱形灯箱，它的侧面最多可以张贴海报的面积是多少平方米．
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<result>12.56</result>