The perimeter of a rectangular lawn is 22 meters, and its length is 8 meters. What is the area of the rectangle?
一个长方形草坪的周长是22米，它的长是8米，这个长方形的面积是多少．
<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<gadget id="calculator">11 - 8</gadget>
<output>3</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>