A rectangular piece of paper with a length of 5 decimeters and a width of 3 decimeters is rolled into a cylinder. What is the lateral area of the cylinder in square decimeters?
将一张长5分米，宽3分米的长方形纸片卷成一个圆柱，这个圆柱的侧面积是多少平方分米．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>