cylinder is surrounded by a piece of rectangular paper with a length of 15 cm and a width of 8 cm. What is the lateral area of the cylinder?
用一张长15厘米，宽8厘米长方形纸围一个圆柱体，这个圆柱体的侧面积是多少．
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>