If the perimeter of a rectangle is 56 cm and its width is 12 cm, what is its area?
一个长方形的周长是56厘米，已知宽等于12厘米，它的面积是多少．
<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<gadget id="calculator">28 - 12</gadget>
<output>16</output>

<gadget id="calculator">16 * 12</gadget>
<output>192</output>

<result>192</result>