Use a piece of rectangular paper with a length of 15 cm and a width of 12 cm to enclose a cylinder without upper and lower bottoms. What is the lateral area of the cylinder?
用一张长15厘米，宽12厘米的长方形纸围成一个没有上下底面的圆柱，这个圆柱的侧面积是多少．
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<result>180</result>