A basketball court is a rectangle. Do you know the size of a standard basketball court? Tell you that its length is 28 meters and its width is 15 meters. What is its area in square meters?
篮球场是一个长方形，你了解标准篮球场的大小吗？告诉你它的长是28米，宽是15米，它的面积是多少平方米？
<gadget id="calculator">28 * 15</gadget>
<output>420</output>

<result>420</result>