Use a piece of rectangular paper with a length of 15cm and a width of 10cm to form the largest cylindrical paper tube. What is the lateral area of the paper tube in cm**2.
用一张长15cm，宽10cm的长方形纸片围成一个最大的圆柱形纸筒，这个纸筒的侧面积是多少cm**2．
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>