Take a piece of square cardboard with a side length of 6 decimeters and roll it into the largest paper tube. What is the lateral area of the tube in square centimetres.
用一张边长6分米的正方形纸板，卷成一个最大的纸筒．纸筒的侧面积是多少平方分米．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>