A parallelogram billboard with a base of 12 meters and a height of 15 meters. What is the area of this parallelogram?
一个平行四边形的广告牌，底12米，高15米．这个平行四边形的面积是多少？
<gadget id="calculator">12 * 15</gadget>
<output>180</output>

<result>180</result>