piece of white paper with a length of 10 decimeters and a width of 6 decimeters is surrounded to form a cylindrical paper tube. What is the lateral area of the paper tube in square decimeters?
把一张长10分米，宽6分米的白纸，围成一个圆柱形纸筒，这个纸筒的侧面积是多少平方分米．
<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<result>60</result>