Expand the side of the cylinder to get a rectangle with a length of 18 cm and a width of 12 cm. What is the lateral area of the cylinder in square centimeters?
把圆柱的侧面展开得到一个长18厘米，宽12厘米的长方形，这个圆柱的侧面积是多少平方厘米．
<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<result>216</result>