The length of a rectangle is 7 meters and the width is 4 meters. Now cut out the largest square from this rectangle. What is the area of the remaining figure in square meters?
一个长方形的长是7米，宽是4米，现在在这个长方形中剪去一个最大的正方形，剩下的图形的面积是多少平方米？
<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>