If a square paper with a side length of 6 cm is surrounded to form the largest cylindrical paper tube, what is the lateral area of the paper tube in square centimeters? (The loss at the seam is ignored)
把一个边长为6厘米的正方形纸围成一个最大的圆柱形纸筒，这个纸筒的侧面积是多少平方厘米．(接缝处损耗忽略不计)
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>